Asymmetric siRNA for inhibiting expression of male pattern hair loss target gene

ABSTRACT

The present invention relates to an asymmetric siRNA which inhibits an expression of male pattern hair loss target genes and a use thereof and, more particularly, to an asymmetric siRNA which inhibits an expression of 3-oxo-5-alpha-steroid-4-dehydrogenase 1 (SRD5A1) gene, 3-oxo-5-alpha-steroid-4-dehydrogenase 2 (SRD5A2) gene or androgen receptor (AR) gene, and a composition for prevention or treatment of hair loss comprising the asymmetric siRNA.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application is a U.S. national phase under the provisions of 35 U.S.C. § 371 of International Patent Application No. PCT/KR18/02103 filed Feb. 21, 2018, which in turn claims priority of Korean Patent Application No. 10-2017-0022909 filed Feb. 21, 2017. The disclosures of International Patent Application No. PCT/KR18/02103 and Korean Patent Application No. 10-2017-0022909 are hereby incorporated herein by reference in their respective entireties, for all purposes.

TECHNICAL FIELD

The present invention relates to asymmetric siRNA for inhibiting the expression of a target gene for male pattern hair loss and a use thereof, and more particularly to asymmetric siRNA for inhibiting the expression of the 3-oxo-5-alpha-steroid 4-dehydrogenase 1 (SRD5A1) gene, the 3-oxo-5-alpha-steroid 4-dehydrogenase 2 (SRD5A2) gene, or the androgen receptor (AR) gene, and a composition for preventing or treating hair loss which comprises the asymmetric siRNA.

BACKGROUND ART

Human hair is formed in hair follicles. There are papillae in the hair follicles, small blood vessels are distributed in the papillae to supply nutrients necessary for hair growth, and sebaceous glands are distributed on the upper ends of side surfaces of the papillae to secrete sebum to protect the hair. The dermal papilla regulates hair growth and is the site where male hormones act in male-pattern hair loss. The hair matrix is a site where cell division occurs under the control of the dermal papilla and hair grows.

The main factor of male hair loss is due to the effect of abnormal hormones. At puberty, sex hormones are actively secreted and the secondary sexual character appears. These changes are caused by sex hormones, i.e., androgens (male hormones) and estrogens (female hormones). Androgens develop body hair under the eyebrows, and estrogen mainly promotes hair growth. For men, hair loss is due to excessive secretion of androgens which results in inhibition of the action of estrogen by the excessively secreted androgens.

Specifically, steroid 5-alpha reductase is involved in the male hair loss mechanism by male hormones, and steroid 5-alpha reductase is a main enzyme that reduces testosterone, which is a male hormone, to DHT (dihydrotestosterone). The resulting DHT is known to bind to an androgen receptor to thereby regulate hair growth in the hair follicles and be involved in the proliferation of sebaceous glands.

The androgen receptor is a male hormone (androgen) receptor and is known to be capable of binding to both testosterone and DHT, but have a stronger binding affinity with DHT. It is known that the inhibition of steroid 5-alpha reductase and an androgen receptor increases hair growth factors and induces hair growth, whereas the activation of steroid 5-alpha reductase and an androgen receptor inhibits hair growth, resulting in the occurrence of hair loss (Chhipa, R R et al., Prostate, 73:1483, 2013; Azzouni, F et al, Advances in Urology, 2012:18, 2012; Winiarska, A. et al., Skin Pharmacology and Physiology, 19:311, 2006).

There are two types of steroid 5-alpha reductase: type 1 and type 2. Steroid 5-alpha reductase type 1 is mainly distributed throughout the skin, especially in the sebaceous glands, and steroid 5-alpha reductase type 2 is mainly distributed around the dermal papilla of the hair follicles and in the outer root sheath. In the early stage of drug development, hair loss therapeutic agents targeting only steroid 5-alpha reductase type 2 have mainly been developed, but therapeutic agents for inhibiting both steroid 5-alpha reductase type 1 and type 2 have recently been developed since the type 1 also has been found to affect hair growth.

Among these, finasteride may be used as a drug for inhibiting steroid 5-alpha reductase type 2. Finasteride was originally developed as a therapeutic agent for benign prostatic hypertrophy, it has been approved by the FDA and the Korean Food and Drug Administration as a male pattern hair loss therapeutic agent since finasteride was confirmed to promote hair growth in patients administered. Dutasteride is known to be a therapeutic ingredient that inhibits both steroid 5-alpha reductase type 1 and type 2. Drugs which bind to the androgen receptor and thus acts as an antagonist that hinders the binding between the androgen receptor and DHT are called anti-androgen drugs, and as these anti-androgen drugs, Cimetidine, Spironolactone, Flutamide, Cyproterone acetate, and the like are known.

However, these therapeutic ingredients have problems such as sexual dysfunction, fatigue appeal, and the like, and the use thereof is limited in women of childbearing age. These may cause fetal malformations when exposed to pregnant women. Therefore, there is a need to develop a therapeutic agent for hair loss without such side effects.

Under these technical backgrounds, the inventors of the present invention confirmed that a novel RNAi drug with minimal side effects developed using siRNA for inhibiting the expression of the 3-oxo-5-alpha-steroid 4-dehydrogenase 1 (SRD5A1) gene, the 3-oxo-5-alpha-steroid 4-dehydrogenase 2 (SRD5A2) gene, or the androgen receptor (AR) gene was able to exhibit a desired effect of preventing or treating hair loss, and thus completed the present invention.

DISCLOSURE Technical Problem

It is an object of the present invention to provide asymmetric shorter duplex siRNA (asiRNA) specifically binding to a SRD5A1-encoding gene, a SRD5A2-encoding gene, or an AR-encoding gene.

It is another object of the present invention to provide a composition for preventing or treating hair loss which comprises the asiRNA, or a method of preventing or treating hair loss.

Technical Solution

To achieve the above object, the present invention provides siRNA specifically binding to mRNA of a 3-oxo-5-alpha-steroid 4-dehydrogenase 1 (SRD5A1)-encoding gene, mRNA of a 3-oxo-5-alpha-steroid 4-dehydrogenase 2 (SRD5A2)-encoding gene, or mRNA of an androgen receptor (AR)-encoding gene and comprising a sense strand having a length of 15-17 nt and an antisense strand complementary to the sense strand and having a length of 19 nt or more, wherein the 3′-terminus of the sense strand and the 5′-terminus of the antisense strand form a blunt end.

The present invention also provides a composition for preventing or treating hair loss which comprises the siRNA.

The present invention also provides a method of preventing or treating hair loss, comprising administering the siRNA to a subject.

The present invention also provides a use of the siRNA for preventing or treating hair loss.

The present invention also provides a use of the siRNA for preparing a drug for the prevention or treatment of hair loss.

DESCRIPTION OF DRAWINGS

FIGS. 1A and 1B illustrate results showing the gene inhibitory efficiency of asiRNA against 100 sequences targeting SRD5A1. HuH-7 cells were transfected with 0.3 nM asiRNA targeting each nucleotide sequence, and after 24 hours, the expression level of SRD5A1 mRNA was measured using qRT-PCR, and the graphs show the mean and SD of two repeated experiments.

FIG. 2 illustrates results showing the gene inhibitory efficiency of asiRNA against 12 sequences targeting SRD5A1. HuH-7 cells were transfected with 0.3 nM, 1 nM, or 10 nM asiRNA targeting each nucleotide sequence, and after 48 hours, the expression level of the SRD5A1 protein was measured by western blotting.

FIG. 3 illustrates results showing the gene inhibitory efficiency of 12 kinds of cp-asiRNAs targeting SRD5A1 and having various chemical modifications added thereto, through two repeated experiments. HuH-7 cells were incubated with 1 μM or 3 μM cp-asiRNA targeting each nucleotide sequence, and after 48 hours, the expression level of the SRD5A1 protein was measured by western blotting.

FIG. 4 illustrates results showing the gene inhibitory efficiency of 2 kinds of cp-asiRNA targeting SRD5A1 and having various chemical modifications added thereto. HuH-7 cells were incubated with 0.3 μM, 1 μM, or 3 μM cp-asiRNA targeting each nucleotide sequence, and after 24 hours, the expression level of SRD5A1 mRNA was measured using real-time PCR, and the graph shows the mean and SD of four repeated experiments.

FIGS. 5A and 5B illustrate results showing the gene inhibitory efficiency of asiRNA against 112 sequences targeting SRD5A2. HuH-7 cells were transfected with 0.3 nM asiRNA targeting each nucleotide sequence, and after 24 hours, the expression level of SRD5A2 mRNA was measured using qRT-PCR, and the graphs show the mean and SD of two repeated experiments.

FIG. 6A illustrates results showing the gene inhibitory efficiency of asiRNA against 23 sequences targeting SRD5A2, and FIG. 6B illustrates results showing the gene inhibitory efficiency of asiRNA against 6 sequences and 4 sequences, which target SRD5A2. HuH-7 cells were transfected with 3 nM or 10 nM of asiRNA targeting each nucleotide sequence, and after 48 hours, the expression level of the SRD5A2 protein was measured by western blotting.

FIG. 7 illustrates results showing the gene inhibitory efficiency of 12 kinds of cp-asiRNA targeting SRD5A2 and having various chemical modifications added thereto, through two repeated experiments. HuH-7 cells were incubated with 1 μM of cp-asiRNA targeting each nucleotide sequence, and after 48 hours, the expression level of the SRD5A2 protein was measured by western blotting.

FIG. 8 illustrates results showing the gene inhibitory efficiency of 2 selected kinds of cp-asisRD5A2. HuH-7 cells were incubated with cp-asiRNA targeting each nucleotide sequence at a concentration ranging from 1.95 nM to 1,000 nM, and after 24 hours, the expression level of SRD5A2 mRNA was measured by RT-PCR.

FIG. 9 illustrates results showing the gene inhibitory efficiency of 2 selected kinds of cp-asiSRD5A2. HuH-7 cells were incubated with 0.1 μM, 0.3 μM, 1 μM, or 3 μM of cp-asiRNA targeting each nucleotide sequence, and after 48 hours, the expression level of the SRD5A2 protein was measured by western blotting.

FIGS. 10A and 10B illustrate results showing the gene inhibitory efficiency of asiRNA against 118 sequences targeting AR. A549 cells were transfected with 0.3 nM of asiRNA targeting each nucleotide sequence, and after 24 hours, the expression level of AR mRNA was measured through qRT-PCR, the graphs showing the mean and SD of two repeated experiments.

FIG. 11 illustrates results showing the inhibitory efficiency of asiRNA against 20 sequences targeting AR at a protein level. A549 cells were transfected with 0.3 nM asiRNA targeting each nucleotide sequence, and after 48 hours, the expression level of the AR protein was measured by western blotting, and experiments were repeated three times.

FIG. 12 illustrates results showing the gene inhibitory efficiency of asiRNA against 9 sequences targeting AR. A549 cells were transfected with 0.1 nM asiRNA targeting each nucleotide sequence, and after 48 hours, the expression levels of AR mRNA and the AR protein were measured by qRT-PCR and western blotting, respectively.

FIG. 13 illustrates results showing the gene inhibitory efficiency of 9 kinds of cp-asiRNA targeting an AR and having various chemical modifications added thereto. A549 cells were incubated with 1 μM or 3 μM of cp-asiRNA targeting each nucleotide sequence, and after 48 hours, the expression level of AR mRNA was measured through real-time PCR, and the graph shows the mean and SD of four repeated experiments.

FIG. 14 illustrates results showing the gene inhibitory efficiency of 9 kinds of cp-asiRNA targeting an AR and having various chemical modifications added thereto. A549 cells were incubated with 1 μM of cp-asiRNA targeting each nucleotide sequence, and after 48 hours, the expression level of the AR protein was measured using a western blotting assay.

DETAILED DESCRIPTION AND EXEMPLARY EMBODIMENTS

Unless otherwise defined, all technical and scientific terms as used herein have the same meanings as those commonly understood by one of ordinary skill in the art to which the present invention pertains. Generally, the nomenclature used herein is well known and commonly used in the art.

Accordingly, in one aspect, the present invention relates to siRNA specifically binding to mRNA of a 3-oxo-5-alpha-steroid 4-dehydrogenase 1 (SRD5A1)-encoding gene having SEQ ID NOs: 669, 670 or 671, mRNA of a 3-oxo-5-alpha-steroid 4-dehydrogenase 2 (SRD5A2)-encoding gene having SEQ ID NO: 672, or mRNA of an androgen receptor (AR)-encoding gene having SEQ ID NO: 673 and comprising a sense strand having a length of 15-17 nt and an antisense strand complementary to the sense strand and having a length of 19 nt or more, wherein the 3′-terminus of the sense strand and the 5′-terminus of the antisense strand form a blunt end.

The SRD5A1-encoding gene, which is a target gene for male pattern hair loss, for example, androgenetic alopecia, has mRNA Accession Number: NM_001047.3, NM_001324322.1, or NM_001324323.1, which respectively include sequences with SEQ ID: 669, SEQ ID NO: 670, and SEQ ID NO: 671. The SRD5A2-encoding gene has mRNA Accession Number: NM_000348.3 and includes a sequence having SEQ ID NO: 672. The AR-encoding gene has mRNA Accession Number: NM_001011645.2 and includes a sequence having SEQ ID NO: 673.

In the present invention, siRNA is a concept including all substances having a general RNA interference (RNAi) action. RNAi is an intracellular mechanism for gene regulation that was first found in Caenorhabditis elegans in 1998, and as for the mechanism action, it is known that the antisense strand of a double-stranded RNA introduced into a cell complementarily binds to mRNA of a target gene to thereby induce the degradation of the target gene. In this regard, small interfering RNA (siRNA) is one of the methods of inhibiting gene expression in vitro. siRNAs of 19-21 bp in length are theoretically capable of performing selective inhibition against almost all genes, and thus can be developed as therapeutic agents for various gene-related diseases such as cancer, viral infection, and the like, and is the new candidate drug development technology that has recently drawn the most attention. The first attempt to perform in vivo treatment using siRNA in mammals was in mid-2003, and since then, there have been numerous reports of in vivo treatment thanks to many attempts for application studies.

However, contrary to the possibility of in vivo treatment, side effects and disadvantages of siRNA have continually been reported. To develop an RNAi-based therapeutic agent, challenges such as: 1) the absence of an effective delivery system; 2) the off-target effect; 3) the induction of immune responses; and 4) intracellular RNAi mechanism saturation need to be overcome. Although siRNAs are an effective method of directly regulating target gene expression, it is difficult to develop a therapeutic agent using such siRNAs due to the above-described problems. With regard thereto, the applicant of the present invention has developed an asymmetric shorter duplex siRNA (asiRNA) structure-related technology (WO2009/078685). asiRNA is an asymmetric RNAi-inducing structure having a shorter double helix length than the 19+2 structure of existing siRNAs. asiRNA is a technology that has overcome known problems with the existing siRNA structure technology, such as the off-target effect, RNAi mechanism saturation, immune responses by TLR3, and the like, and accordingly is used for the development of a new RNAi drug with minimal side effects.

Based on this, the present invention provides asymmetric siRNA including a sense strand having a length of 15-17 nt and an antisense strand complementary to the sense strand and having a length of 19 nt or more, and thus the siRNA according to the present invention may stably maintain high delivery efficiency without incurring problems such as the off-target effect, RNAi mechanism saturation, immune responses by TLR3, and the like, and may inhibit the expression of a 5α-reductase type 1 target gene, a 5α-reductase type 2 target gene, and an androgen receptor target gene.

In the present invention, the term “sense strand” refers to a polynucleotide having the same nucleic acid sequence as that of the SRD5A1-, SRD5A2-, or AR-encoding gene, and has a length of 15-17 nt. In one embodiment, the sense strand may have a length of 15 nt, 16 nt, or 17 nt.

The inventors of the present application selected, as target genes, 5α-reductase type 1, 5α-reductase type 2, and an androgen receptor, which play a major role in inhibiting the synthesis of proteins required for hair follicle growth in male pattern hair loss and inducing hair loss by reducing the dermal papilla. As a result of screening 100 or more siRNAs targeting each target gene and selecting siRNAs with excellent inhibitory efficiency from among the same, it was confirmed that siRNA comprising a sense strand having one selected from SEQ ID NOS: 5, 6, 15, 18, 40, 48, 49, 59, 62, 69, 77, 86, 205, 208, 228, 231, 232, 233, 237, 238, 239, 240, 242, 248, 249, 259, 260, 262, 265, 283, 284, 285, 291, 292, 300, 471, 477, 498, 500, 502, 503, 505, 506, 507, 509, 510, 515, 517, 518, 521, 524, 534, 538, 539, and 546 and an antisense strand complementary to the sense strand, effectively reduced the expression of mRNA of the SRD5A1-, SRD5A2-, or AR-encoding gene.

Specifically, siRNA comprising a sense strand having SEQ ID NO: 5, 6, 15, 18, 40, 48, 49, 59, 62, 69, 77, or 86 and an antisense strand complementary to the sense strand, may reduce the expression of mRNA of the SRD5A1-encoding gene, siRNA comprising a sense strand having SEQ ID NO: 205, 208, 228, 231, 232, 233, 237, 238, 239, 240, 242, 248, 249, 259, 260, 262, 265, 283, 284, 285, 291, 292, or 300 and an antisense strand complementary to the sense strand, may reduce the expression of mRNA of the SRD5A2-encoding gene, and siRNA comprising a sense strand having SEQ ID NO: 471, 477, 498, 500, 502, 503, 505, 506, 507, 509, 510, 515, 517, 518, 521, 524, 534, 538, 539, or 546 and an antisense strand complementary to the sense strand, may reduce the expression of mRNA of the AR-encoding gene.

Specifically, it was confirmed that siRNA comprising a sense strand having one selected from the group consisting of SEQ ID NOS: 48, 49, 69, 86, 231, 259, 260, 262, 498, 500, 506, 509, 510, 518, 538, 539, and 546 and an antisense strand complementary to the sense strand also effectively inhibited the expression of the SRD5A1 protein, the SRD5A2 protein, or the AR protein.

The 3′-terminus of the sense strand and the 5′-terminus of the antisense strand form a blunt end. For example, the 5′-terminus of the antisense strand may include, for example, an overhang of 1 nt, 2 nt, 3 nt, 4 nt, 5 nt, 6 nt, 7 nt, or 8 nt.

In the present invention, the antisense strand is a polynucleotide complementary to the target gene and has a length of 19 nt or more, for example, 20 nt or more, 21 nt or more, 22 nt or more, 23 nt or more, 24 nt or more, 25 nt or more, 26 nt or more, 27 nt or more, 29 nt or more, 30 nt or more, or 31 nt or more. In one embodiment, the antisense strand may have a length between 19 nt and 24 nt, for example, 19 nt, 20 nt, 21 nt, 22 nt, 23 nt, or 24 nt. The antisense strand may have a sequence partially complementary to the sense strand in consideration of the asymmetric structure.

The antisense strand may, for example, be selected from the group consisting of SEQ ID NOS: 105, 106, 115, 118, 140, 148, 149, 159, 162, 169, 177, 186, 317, 320, 340, 343, 344, 345, 349, 350, 351, 352, 354, 360, 361, 371, 372, 374, 377, 395, 396, 397, 403, 404, 412, 589, 595, 616, 618, 620, 621, 623, 624, 625, 627, 628, 633, 635, 636, 639, 642, 652, 656, 657, and 664.

Specifically, it was confirmed that siRNA comprising an antisense strand selected from the group consisting of SEQ ID NOS: 148, 149, 169, 186, 343, 371, 372, 374, 616, 618, 624, 627, 628, 636, 656, 657, and 664 also effectively inhibited the expression of the SRD5A1 protein, the SRD5A2 protein, or the AR protein.

In some embodiments, the sense strand or antisense strand of the siRNA may include one or more chemical modifications.

General siRNAs are unable to penetrate through the cell membrane due to reasons such as high negative charge, high molecular weight, and the like, and are rapidly degraded and eliminated in the blood, making it difficult to deliver an amount sufficient for RNAi induction to an actual target site. Currently, in the case of in vitro delivery, numerous high-efficiency delivery methods using cationic lipids and cationic polymers have been developed, but in vivo delivery of siRNA as efficient as in vitro delivery thereof is difficult, and siRNA delivery efficiency is reduced by interactions between various proteins present in the living body.

Therefore, the inventors of the present application developed cell penetrating asiRNA (cp-asiRNA) having self-transfer ability that enables effective intracellular delivery without a separate delivery vehicle by introducing a chemical modification into an asymmetric siRNA structure.

The chemical modification in the sense strand or the antisense strand may comprise, for example, at least one selected from the group consisting of:

a modification in which an —OH group at the 2′ carbon position of a sugar structure in a nucleotide is substituted with —CH₃ (methyl), —OCH₃ (methoxy), —NH₂, —F (fluorine), —O-2-methoxyethyl-O-propyl, —O-2-methylthioethyl, —O-3-aminopropyl, or —O-3-dimethylaminopropyl;

a modification in which oxygen in a sugar structure in a nucleotide is substituted with sulfur;

a modification of a nucleotide bond to a phosphorothioate, boranophosphate or methyl phosphonate;

a modification to peptide nucleic acid (PNA), locked nucleic acid (LNA), or unlocked nucleic acid (UNA); and

cholesterol or cell-penetrating peptide binding.

In one embodiment, the chemical modification in the sense or antisense strand may be substitution of an —OH group at the 2′ carbon position of a sugar structure in a nucleotide with —CH₃ (methyl), modification of a nucleotide bond into phosphorothioate, or cholesterol binding. This may enhance the in vivo stability of siRNA.

When the —OH group at the 2′ carbon position of a sugar structure is substituted with —CH₃ (methyl) or when the nucleotide bond is modified into a phosphorothioate, resistance to nucleases may be increased, and binding to the cell membrane via cholesterol binding may facilitate the intracellular delivery of siRNA.

In particular, the chemical modification may include at least one modification selected from the group consisting of: a modification in which an —OH group at the 2′ carbon position of a sugar structure in the 5′- or 3′-terminus nucleotide of the sense strand is substituted with —CH₃ (methyl); a modification in which an —OH group at the 2′ carbon position of a sugar structure in two or more nucleotides of the sense strand or the antisense strand is substituted with —CH₃ (methyl); a modification of 25% or more of nucleotides bonds in the sense or antisense strand to phosphorothioate; and cholesterol binding at the 3′-terminus of the sense strand.

With regard to the modification in which an —OH group at the 2′ carbon position of a sugar structure in a nucleotide is substituted with —CH₃ (methyl), the —OH group at the 2′ carbon position of the sugar structure in a nucleotide positioned at the 5′-terminus of the sense strand may be substituted with —CH₃ (methyl). In addition, a 2′-O-methylated nucleoside, in which an —OH group at the 2′ carbon position of a sugar structure is substituted with —CH₃ (methyl), may be continuously or discontinuously included in a 5′-terminus to 3′-terminus direction of the sense strand. 2′-O-methylated nucleosides and unmodified nucleosides may be alternately included in the sense strand. 2, 3, 4, 5, 6, 7, or 8 consecutive 2′-O-methylated nucleosides and unmodified nucleosides may be alternately included in the sense strand. For example, two or more, three or more, four or more, five or more, six or more, seven or more, eight or more, 2 to 8, or 8 2′-O-methylated nucleosides may be present in the sense strand.

2′-O-methylated nucleosides may be continuously or discontinuously included in a 5′-terminus to 3′-terminus of the antisense strand. 2′-O-methylated nucleosides and unmodified nucleotides may be alternately included in the antisense strand. 2, 3, 4, 5, 6, 7, or 8 consecutive 2′-O-methylated nucleosides and unmodified nucleosides may be alternately included in the antisense strand. For example, two or more, three or more, four or more, five or more, six or more, seven or more, eight or more, or 2-7 2′-O-methylated nucleosides may be present in the antisense strand.

With regard to the modification of a nucleotide bond to a phosphorothioate, at least 25%, 30%, 35%, 40%, 45%, 50%, 55%, 60%, 65%, 70%, 75%, 80%, 85%, 90%, or 95% of bonds between ribonucleotides in the sense strand may be modified into phosphorothioate. In some embodiments, all (100%) of the bonds between ribonucleotides in the sense strand may be modified into phosphorothioate.

At least 25%, 30%, 35%, 40%, 45%, 50%, 55%, 60%, 65%, 70%, 75%, 80%, 85%, 90%, or 95% of the bonds between ribonucleotides in the antisense strand may be modified into phosphorothioate. In some embodiments, a total (100%) of the bonds between ribonucleotides in the antisense strand may be modified into phosphorothioate.

In another aspect, the present invention relates to a composition for the prevention or treatment of hair loss, which comprises the siRNA.

The term “treatment” as used herein means reducing the symptoms of hair loss or the severity of hair loss in a subject to which the composition is administered or preventing the same from being aggravated, and in some cases may include the progression of hair growth. The term “prevention” as used herein means preventing or delaying the initiation of hair loss, or reducing the possibility of developing hair loss.

The composition may further be prepared including one or more pharmaceutically acceptable carriers, in addition to the siRNA as an active ingredient. The pharmaceutically acceptable carrier has to be compatible with the active ingredient of the present invention, and may be one selected from physiological saline, sterile water, Ringer's solution, buffered saline, dextrose solution, maltodextrin solution, glycerol, ethanol, and a mixture of two or more of these components. If necessary, the composition may include other general additives such as an antioxidant, a buffer, a bacteriostatic agent, and the like. In addition, the composition may be formulated into an injectable preparation such as an aqueous solution, a suspension, an emulsion, or the like by further adding a diluent, a dispersing agent, a surfactant, a binder, and a lubricant. In particular, the composition may be formulated into a lyophilized preparation. The lyophilized preparation may be formulated using a method commonly used in the art to which the present invention pertains, and a stabilizer for lyophilization may also be added.

An administration method of the composition may be determined by one of ordinary skill in the art on the basis of general symptoms of patients and the severity of diseases. In addition, the composition may be formulated into various forms such as powders, tablets, capsules, liquids, injections, ointments, syrups, and the like, and may also be provided in a unit dosage or multiple dosage container, for example, sealed ampoules and vials, and the like.

The composition may be administered orally or parenterally. The administration route of the composition according to the present invention may be, but is not limited to, for example, oral administration, intravenous administration, intramuscular administration, intraarterial administration, intramedullary administration, intradural administration, intracardiac administration, transdermal administration, subcutaneous administration, intraperitoneal administration, intestinal administration, sublingual administration, or topical administration. The dosage of the composition according to the present invention varies depending on the body weight, age, gender, and health condition of a patient, diet, administration time, administration method, excretion rate, severity of disease, or the like, and may be easily determined by those of ordinary skill in the art. In addition, for clinical administration, the composition of the present invention may be formulated into a suitable form using known techniques.

In another aspect of the present invention, there is provided a method of preventing or treating hair loss, comprising administering the siRNA to a subject.

In another aspect, the present invention relates to a use of the siRNA for preventing or treating hair loss.

In another aspect, the present invention relates to a use of the siRNA for preparing a drug for the prevention or treatment of hair loss.

Configurations included in the prevention or treatment method according to the present invention are the same as those included in the aforementioned embodiments, and thus the foregoing description may be equally applied to the prevention or treatment method.

Hereinafter, the present invention will be described in further detail with reference to the following examples. It will be obvious to those of ordinary skill in the art that these examples are provided for illustrative purposes only and are not intended to limit the scope of the present invention.

[Example 1] Screening for 100 Kinds of RNAi-Inducing Double-Stranded Nucleic Acid Molecules Targeting SRD5A1

To obtain high-efficiency RNAi-inducing double-stranded nucleic acid molecules targeting SRD5A1, the target sequence of the SRD5A1 gene was selected and then asiRNA was designed. The asiRNA structure is different from that of generally known siRNAs, and thus when the nucleotide sequences of asiRNA are designed using a general siRNA design program, it may be somewhat difficult to design an optimized asiRNA. Therefore, asiRNA was constructed by the following method. An NCBI db search was used to obtain information on the SRD5A1 gene (mRNA Accession Number: NM_001047.3, NM_001324322.1, NM_001324323.1), which is the target gene pertaining to male pattern hair loss (androgenetic hair loss). For subsequent animal experiments, nucleotide sequences were secured in consideration of the nucleotide sequence homology with mice, and then 100 kinds of asiRNA were designed according to a design method such as the exclusion of sequences having a GC content of 30-62% and 4 or more G or C consecutive bases, and then synthesized by OliX Inc. (Korea). The synthesized sense and antisense strand RNA oligonucleotides were annealed at 95° C. for 2 minutes through incubation at 37° C. for 1 hour, and the asiRNA annealed by 10% polyacrylamide gel electrophoresis (PAGE) was confirmed using a UV transilluminator.

TABLE 1 100 Kinds of asiRNA nucleotide sequences targeting 3-oxo-5-alpha-steroid 4-dehydrogenase 1 100 kinds Sequence (5′-3′) No. Name S AS 1 asiSRD5A1 1 GCAGAUACUUGAGCCA UGGCUCAAGUAUCUG CUUUGC (SEQ ID NO: 1) (SEQ ID NO: 101) 2 asiSRD5A1 2 AAGCAGAUACUUGAGC GCUCAAGUAUCUGCU UUGCAA (SEQ ID NO: 2) (SEQ ID NO: 102) 3 asiSRD5A1 3 CAAAGCAGAUACUUGA UCAAGUAUCUGCUUU GCAAAU (SEQ ID NO: 3) (SEQ ID NO: 103) 4 asiSRD5A1 4 UGCAAAGCAGAUACUU AAGUAUCUGCUUUGC AAAUAG (SEQ ID NO: 4) (SEQ ID NO: 104) 5 asiSRD5A1 5 GUGCAGUGUAUGCUGA UCAGCAUACACUGCA CAAUGG (SEQ ID NO: 5) (SEQ ID NO: 105) 6 asiSRD5A1 6 UUGUGCAGUGUAUGCU AGCAUACACUGCACA AUGGCU (SEQ ID NO: 6) (SEQ ID NO: 106) 7 asiSRD5A1 7 CAUUGUGCAGUGUAUG CAUACACUGCACAAU GGCUCA (SEQ ID NO: 7) (SEQ ID NO: 107) 8 asiSRD5A1 8 UUUUGGCUUGUGGUUA UAACCACAAGCCAAA ACCUAU (SEQ ID NO: 8) (SEQ ID NO: 108) 9 asiSRD5A1 9 CGGGCAUGUUGAUAAA UUUAUCAACAUGCCC GUUAAC (SEQ ID NO: 9) (SEQ ID NO: 109) 10 asiSRD5A1 10 AUAUCCUAAGGAAUCU AGAUUCCUUAGGAUA UGAUCU (SEQ ID NO: 10) (SEQ ID NO: 110) 11 asiSRD5A1 11 AUCUCAGAAAACCAGG CCUGGUUUUCUGAGA UUCCUU (SEQ ID NO: 11) (SEQ ID NO: 111) 12 asiSRD5A1 12 GAAUCUCAGAAAACCA UGGUUUUCUGAGAUU CCUUAG (SEQ ID NO: 12) (SEQ ID NO: 112) 13 asiSRD5A1 13 AGGAAUCUCAGAAAAC GUUUUCUGAGAUUCC UUAGGA (SEQ ID NO: 13) (SEQ ID NO: 113) 14 asiSRD5A1 14 CUGGAUACAAAAUACC GGUAUUUUGUAUCCA GUAUCU (SEQ ID NO: 14) (SEQ ID NO: 114) 15 asiSRD5A1 15 UACUGGAUACAAAAUA UAUUUUGUAUCCAGU AUCUCC (SEQ ID NO: 15) (SEQ ID NO: 115) 16 asiSRD5A1 16 GAUACUGGAUACAAAA UUUUGUAUCCAGUAU CUCCUG (SEQ ID NO: 16) (SEQ ID NO: 116) 17 asiSRD5A1 17 GAGAUACUGGAUACAA UUGUAUCCAGUAUCU CCUGGU (SEQ ID NO: 17) (SEQ ID NO: 117) 18 asiSRD5A1 18 AGGAGAUACUGGAUAC GUAUCCAGUAUCUCC UGGUUU (SEQ ID NO: 18) (SEQ ID NO: 118) 19 asiSRD5A1 19 CCAGGAGAUACUGGAU AUCCAGUAUCUCCUG GUUUUC (SEQ ID NO: 19) (SEQ ID NO: 119) 20 asiSRD5A1 20 AAUACCAAGGGGAGGC GCCUCCCCUUGGUAU UUUGUA (SEQ ID NO: 20) (SEQ ID NO: 120) 21 asiSRD5A1 21 AAAAUACCAAGGGGAG CUCCCCUUGGUAUUU UGUAUC (SEQ ID NO: 21) (SEQ ID NO: 121) 22 asiSRD5A1 22 GAGGCUUAUUUGAAUA UAUUCAAAUAAGCCU CCCCUU (SEQ ID NO: 22) (SEQ ID NO: 122) 23 asiSRD5A1 23 CAGCCAACUAUUUUGG CCAAAAUAGUUGGCU GCAGUU (SEQ ID NO: 23) (SEQ ID NO: 123) 24 asiSRD5A1 24 UGCAGCCAACUAUUUU AAAAUAGUUGGCUGC AGUUAC (SEQ ID NO: 24) (SEQ ID NO: 124) 25 asiSRD5A1 25 ACUGCAGCCAACUAUU AAUAGUUGGCUGCAG UUACGU (SEQ ID NO: 25) (SEQ ID NO: 125) 26 asiSRD5A1 26 UAACUGCAGCCAACUA UAGUUGGCUGCAGUU ACGUAU (SEQ ID NO: 26) (SEQ ID NO: 126) 27 asiSRD5A1 27 CGUAACUGCAGCCAAC GUUGGCUGCAGUUAC GUAUUC (SEQ ID NO: 27) (SEQ ID NO: 127) 28 asiSRD5A1 28 AUGGAGUGGUGUGGCU AGCCACACCACUCCA UGAUUU (SEQ ID NO: 28) (SEQ ID NO: 128) 29 asiSRD5A1 29 UCAUGGAGUGGUGUGG CCACACCACUCCAUG AUUUCU (SEQ ID NO: 29) (SEQ ID NO: 129) 30 asiSRD5A1 30 AAUCAUGGAGUGGUGU ACACCACUCCAUGAU UUCUCC (SEQ ID NO: 30) (SEQ ID NO: 130) 31 asiSRD5A1 31 GAAAUCAUGGAGUGGU ACCACUCCAUGAUUU CUCCAA (SEQ ID NO: 31) (SEQ ID NO: 131) 32 asiSRD5A1 32 GAGAAAUCAUGGAGUG CACUCCAUGAUUUCU CCAAAA (SEQ ID NO: 32) (SEQ ID NO: 132) 33 asiSRD5A1 33 CCCUGGCCAGCUGGUC GACCAGCUGGCCAGG GCAUAG (SEQ ID NO: 33) (SEQ ID NO: 133) 34 asiSRD5A1 34 UAUGCCCUGGCCAGCU AGCUGGCCAGGGCAU AGCCAC (SEQ ID NO: 34) (SEQ ID NO: 134) 35 asiSRD5A1 35 GCUAUGCCCUGGCCAG CUGGCCAGGGCAUAG CCACAC (SEQ ID NO: 35) (SEQ ID NO: 135) 36 asiSRD5A1 36 UCAUGAGUGGUACCUC GAGGUACCACUCAUG AUGCUC (SEQ ID NO: 36) (SEQ ID NO: 136) 37 asiSRD5A1 37 CAUCAUGAGUGGUACC GGUACCACUCAUGAU GCUCUU (SEQ ID NO: 37) (SEQ ID NO: 137) 38 asiSRD5A1 38 UCCGGAAAUUUGAAGA UCUUCAAAUUUCCGG AGGUAC (SEQ ID NO: 38) (SEQ ID NO: 138) 39 asiSRD5A1 39 CAGUGUAUGCUGAUGA UCAUCAGCAUACACU GCACAA (SEQ ID NO: 39) (SEQ ID NO: 139) 40 asiSRD5A1 40 GCAUGUUGAUAAACAU AUGUUUAUCAACAUG CCCGUU (SEQ ID NO: 40) (SEQ ID NO: 140) 41 asiSRD5A1 41 GUGGCUAUGCCCUGGC GCCAGGGCAUAGCCA CACCAC (SEQ ID NO: 41) (SEQ ID NO: 141) 42 asiSRD5A1 42 GUGUGGCUAUGCCCUG CAGGGCAUAGCCACA CCACUC (SEQ ID NO: 42) (SEQ ID NO: 142) 43 asiSRD5A1 43 UGGUGUGGCUAUGCCC GGGCAUAGCCACACC ACUCCA (SEQ ID NO: 43) (SEQ ID NO: 143) 44 asiSRD5A1 44 AGUGGUGUGGCUAUGC GCAUAGCCACACCAC UCCAUG (SEQ ID NO: 44) (SEQ ID NO: 144) 45 asiSRD5A1 45 UCUUCACGUUUUGUUU AAACAAAACGUGAAG AAAGCA (SEQ ID NO: 45) (SEQ ID NO: 145) 46 asiSRD5A1 46 GACUUGAGAACCCUUU AAAGGGUUCUCAAGU CAGGCU (SEQ ID NO: 46) (SEQ ID NO: 146) 47 asiSRD5A1 47 CUGUUGGCGUGUACAA UUGUACACGCCAACA GUGGCA (SEQ ID NO: 47) (SEQ ID NO: 147) 48 asiSRD5A1 48 UUAUUUGAAUACGUAA UUACGUAUUCAAAUA AGCCUC (SEQ ID NO: 48) (SEQ ID NO: 148) 49 asiSRD5A1 49 UUCCAAUGGCGCUUCU AGAAGCGCCAUUGGA AAGCUU (SEQ ID NO: 49) (SEQ ID NO: 149) 50 asiSRD5A1 50 AAAGGCAUCUGGACUU AAGUCCAGAUGCCUU UGCCUC (SEQ ID NO: 50) (SEQ ID NO: 150) 51 asiSRD5A1 51 AUCAAUGUGCUCUGGU ACCAGAGCACAUUGA UGGCUC (SEQ ID NO: 51) (SEQ ID NO: 151) 52 asiSRD5A1 52 GAUCACUUUCUGUAAC GUUACAGAAAGUGAU CAUUCU (SEQ ID NO: 52) (SEQ ID NO: 152) 53 asiSRD5A1 53 AUCUUCCUUCUAAUAG CUAUUAGAAGGAAGA UUAGCU (SEQ ID NO: 53) (SEQ ID NO: 153) 54 asiSRD5A1 54 GGCAUUGCUUUGCCUU AAGGCAAAGCAAUGC CAGAUG (SEQ ID NO: 54) (SEQ ID NO: 154) 55 asiSRD5A1 55 UGUACAAUGGCGAUUA UAAUCGCCAUUGUAC ACGCCA (SEQ ID NO: 55) (SEQ ID NO: 155) 56 asiSRD5A1 56 CUUCUCUAUGGACUUU AAAGUCCAUAGAGAA GCGCCA (SEQ ID NO: 56) (SEQ ID NO: 156) 57 asiSRD5A1 57 UUCCAAGGUGAGGCAA UUGCCUCACCUUGGA AGGGCC (SEQ ID NO: 57) (SEQ ID NO: 157) 58 asiSRD5A1 58 UCCAAGGUGAGGCAAA UUUGCCUCACCUUGG AAGGGC (SEQ ID NO: 58) (SEQ ID NO: 158) 59 asiSRD5A1 59 GGUUCAUACGGAGUAA UUACUCCGUAUGAAC CACCAC (SEQ ID NO: 59) (SEQ ID NO: 159) 60 asiSRD5A1 60 AUAGUAGAGAUUGUUG CAACAAUCUCUACUA UAUCCA (SEQ ID NO: 60) (SEQ ID NO: 160) 61 asiSRD5A1 61 UGUUGUCUGUGAAAUU AAUUUCACAGACAAC AAUCUC (SEQ ID NO: 61) (SEQ ID NO: 161) 62 asiSRD5A1 62 UUCAAGCUCUGGGUAA UUACCCAGAGCUUGA AAUUCU (SEQ ID NO: 62) (SEQ ID NO: 162) 63 asiSRD5A1 63 UACCUAAUAAGUACCU AGGUACUUAUUAGGU AGAUUG (SEQ ID NO: 63) (SEQ ID NO: 163) 64 asiSRD5A1 64 AUUGUUGUCUGUGAAA UUUCACAGACAACAA UCUCUA (SEQ ID NO: 64) (SEQ ID NO: 164) 65 asiSRD5A1 65 CAAAAGAGCAUCAUGA UCAUGAUGCUCUUUU GCUCUA (SEQ ID NO: 65) (SEQ ID NO: 165) 66 asiSRD5A1 66 CUAUGGACUUUGUAAA UUUACAAAGUCCAUA GAGAAG (SEQ ID NO: 66) (SEQ ID NO: 166) 67 asiSRD5A1 67 CUGUCUUUGAUGGCAU AUGCCAUCAAAGACA GUUGUA (SEQ ID NO: 67) (SEQ ID NO: 167) 68 asiSRD5A1 68 UCUACCUAAUAAGUAC GUACUUAUUAGGUAG AUUGCA (SEQ ID NO: 68) (SEQ ID NO: 168) 69 asiSRD5A1 69 CUAAUCUUCCUUCUAA UUAGAAGGAAGAUUA GCUAUG (SEQ ID NO: 69) (SEQ ID NO: 169) 70 asiSRD5A1 70 CAUUUUCAGAACAAUA UAUUGUUCUGAAAAU GCCAUC (SEQ ID NO: 70) (SEQ ID NO: 170) 71 asiSRD5A1 71 GAUCUCUUCAAGGUCA UGACCUUGAAGAGAU CACUGU (SEQ ID NO: 71) (SEQ ID NO: 171) 72 asiSRD5A1 72 AGAUUGUUGUCUGUGA UCACAGACAACAAUC UCUACU (SEQ ID NO: 72) (SEQ ID NO: 172) 73 asiSRD5A1 73 AGAGAUUGUUGUCUGU ACAGACAACAAUCUC UACUAU (SEQ ID NO: 73) (SEQ ID NO: 173) 74 asiSRD5A1 74 AGACGAACUCAGUGUA UACACUGAGUUCGUC UGACGA (SEQ ID NO: 74) (SEQ ID NO: 174) 75 asiSRD5A1 75 UCCUCCUGGCCAUGUU AACAUGGCCAGGAGG AUGCAG (SEQ ID NO: 75) (SEQ ID NO: 175) 76 asiSRD5A1 76 CUUAAUUUACCCAUUU AAAUGGGUAAAUUAA GCACCG (SEQ ID NO: 76) (SEQ ID NO: 176) 77 asiSRD5A1 77 UGAUGCGAGGAGGAAA UUUCCUCCUCGCAUC AGAAAU (SEQ ID NO: 77) (SEQ ID NO: 177) 78 asiSRD5A1 78 UGUUCUGUACCUGUAA UUACAGGUACAGAAC AUAAUC (SEQ ID NO: 78) (SEQ ID NO: 178) 79 asiSRD5A1 79 CCUGUAACGGCUAUUU AAAUAGCCGUUACAG GUACAG (SEQ ID NO: 79) (SEQ ID NO: 179) 80 asiSRD5A1 80 CCAUUGUGCAGUGUAU AUACACUGCACAAUG GCUCAA (SEQ ID NO: 80) (SEQ ID NO: 180) 81 asiSRD5A1 81 AACAUCCAUUCAGAUC GAUCUGAAUGGAUGU UUAUCA (SEQ ID NO: 81) (SEQ ID NO: 181) 82 asiSRD5A1 82 UAUCCAAAGUUCAGAA UUCUGAACUUUGGAU ACUCUU (SEQ ID NO: 82) (SEQ ID NO: 182) 83 asiSRD5A1 83 ACCUAAAUACGCUGAA UUCAGCGUAUUUAGG UACUUA (SEQ ID NO: 83) (SEQ ID NO: 183) 84 asiSRD5A1 84 CGCUGAAAUGGAGGUU AACCUCCAUUUCAGC GUAUUU (SEQ ID NO: 84) (SEQ ID NO: 184) 85 asiSRD5A1 85 AAUGGAGGUUGAAUAU AUAUUCAACCUCCAU UUCAGC (SEQ ID NO: 85) (SEQ ID NO: 185) 86 asiSRD5A1 86 AUAUCCUACUGUGUAA UUACACAGUAGGAUA UUCAAC (SEQ ID NO: 86) (SEQ ID NO: 186) 87 asiSRD5A1 87 UAUGAGACUAGACUUU AAAGUCUAGUCUCAU ACACAC (SEQ ID NO: 87) (SEQ ID NO: 187) 88 asiSRD5A1 88 AAUGUCACAAUCCCUU AAGGGAUUGUGACAU UUAUUG (SEQ ID NO: 88) (SEQ ID NO: 188) 89 asiSRD5A1 89 GGUCAACUGCAGUGUU AACACUGCAGUUGAC CUUGAA (SEQ ID NO: 89) (SEQ ID NO: 189) 90 asiSRD5A1 90 GCCAUUGUGCAGUCAU AUGACUGCACAAUGG CUACCC (SEQ ID NO: 90) (SEQ ID NO: 190) 91 asiSRD5A1 91 UGUAAGUGGAGAACUU AAGUUCUCCACUUAC ACACAG (SEQ ID NO: 91) (SEQ ID NO: 191) 92 asiSRD5A1 92 CUCUGCCUGUGUGAGU ACUCACACAGGCAGA GCAGCU (SEQ ID NO: 92) (SEQ ID NO: 192) 93 asiSRD5A1 93 ACCGUGAGCCAUCAAU AUUGAUGGCUCACGG UGAGUG (SEQ ID NO: 93) (SEQ ID NO: 193) 94 asiSRD5A1 94 GGUUUCUCUCUGUCUU AAGACAGAGAGAAAC CAUGUC (SEQ ID NO: 94) (SEQ ID NO: 194) 95 asiSRD5A1 95 UAGUCUAGACCUAGUU AACUAGGUCUAGACU AGAAGA (SEQ ID NO: 95) (SEQ ID NO: 195) 96 asiSRD5A1 96 UAGUGUAAAGAAUGAU AUCAUUCUUUACACU ACAAGG (SEQ ID NO: 96) (SEQ ID NO: 196) 97 asiSRD5A1 97 CUGUACCUGUUAUCAA UUGAUAACAGGUACA GGCUAU (SEQ ID NO: 97) (SEQ ID NO: 197) 98 asiSRD5A1 98 GAAUGCUUCAUGACUU AAGUCAUGAAGCAUU CAACAG (SEQ ID NO: 98) (SEQ ID NO: 198) 99 asiSRD5A1 99 UGCCUUAUCAUCUCAU AUGAGAUGAUAAGGC AAAGCA (SEQ ID NO: 99) (SEQ ID NO: 199) 100 asiSRD5A1 100 CAUCUCAUCUGGAGUU AACUCCAGAUGA GAUGAUAAG (SEQ ID NO: 100) (SEQ ID NO: 200)

[Example 2] Screening for RNAi-Inducing Double-Stranded Nucleic Acid Molecules Targeting SRD5A1

To confirm gene inhibitory efficiency at the mRNA level, 100 selected kinds of asiRNA were transfected into a HuH-7 cell line at a concentration of 0.3 nM, and qRT-PCR was performed to measure the expression level of SRD5A1 mRNA.

The HuH-7 cell line was cultured in Dulbecco's Modified Eagle's Medium (DMEM, Gibco) containing 10% fetal bovine serum (FBS, Gibco) and 100 units/ml of penicillin 100 μg/ml of streptomycin. HuH-7 cells were seeded in a 96-well plate at a density of 5×10³ cells/well, and a reverse transfection experiment was conducted using asiRNA (0.3 nM, OliX Inc.) and Lipofectamine 2000 (1 μl/ml, Invitrogen Inc.) in Opti-MEM (a total volume of 100 μl) in accordance with Invitrogen's protocol. After 24 hours, RNA purification and cDNA synthesis were performed in accordance with a basic protocol provided by TOYOBO SuperPrep, the expression level of the SRD5A1 gene was examined with a SRD5A1 TaqMan probe (Hs00602694_mH) using a Bio-Rad CFX-4000 machine, and the results are illustrated in FIGS. 1A and 1B.

From the results of screening the 100 kinds of asiRNA, the 12 top-ranked asiRNAs (in Table 1, No. 5, 6, 15, 18, 40, 48, 49, 59, 62, 77, and 86) were selected, followed by treatment with 0.3 nM, 1 nM, 3 nM, or 10 nM of asiRNA and western blotting to analyze the protein expression inhibitory effects thereof. HuH-7 cells were seeded in a 6-well plate at a density of 2.5×10³ cells/well, and then a reverse transfection experiment was conducted using asiRNA and Lipofectamine 2000 (1 μl/ml, Invitrogen Inc.) in Opti-MEM (a total volume of 2 ml) in accordance with Invitrogen's protocol. After 48 hours, the cells were lysed using a mammalian protein extraction buffer (GE healthcare), and then proteins were quantified using a Bradford assay. 10 μg of the protein of each sample was electrophoresed using 12% SDS-PAGE at 80 V for 20 minutes and at 120 V for 1 hour, and then transferred onto a PVDE membrane (Bio-Rad) at 300 mA for 1 hour and 20 minutes. After transfer, the membrane was blocked in 5% skim milk for 1 hour and allowed to react with SRD5A1 antibody (ABcam, ab110123) at a ratio of 1:2000 for 12 hours. The next day, the resulting membrane was allowed to react with anti-Goat HRP (Santa Cruz) at a ratio of 1:10000 for 1 hour, and then the expression levels of the SRD5A1 protein were compared with each other using ChemiDoc (Bio-Rad). From the results of FIG. 2, 4 asiRNAs (in Table 1, No. 48, 49, 69, and 86) capable of inhibiting SRD5A1 protein expression were selected.

[Example 3] 16 Kinds of Cp-asiRNA Targeting SRD5A1 Gene and Having Self Cell-Penetrating Ability

SRD5A1 cp-asiRNAs (a total of 16 strands) were designed by applying three modification patterns to 4 kinds (in Table 1, No. 48, 49, 69, and 86) of asiRNA targeting SRD5A1 according to the number and position of 2′OMe (methyl), phosphorothioate bonds (PS), and cholesterol, and then synthesized by OliX Inc. (Korea). cp-asiRNA enhances endocytosis efficiency and stability and thus may penetrate through the cell membrane with high efficiency without the aid of a delivery vehicle to thereby inhibit target gene expression. The synthesized sense and antisense strand RNA oligonucleotides were annealed at 95° C. for 2 minutes through incubation at 37° C. for 1 hour, and cp-asiRNAs annealed by 10% polyacrylamide gel electrophoresis (PAGE) were confirmed by a UV transilluminator.

TABLE 2 16 strands of cp-asiRNA nucleotide sequences targeting SRD5A1 No. Name Sequence (5′-->3′)  1 SRD5A1cp- mUUmAUmUUmGAmAUmACmGU*mA*A* asiRNA S  cholesterol 48  2 SRD5A1cp- UUACGUAUUCAAAUmAmAG*C*C*U*C asiRNA AS  48(2, 4)  3 SRD5A1cp- UUACGUAUUCAAAUmAmAmG*mC*C*U*C asiRNA AS  48(4, 4)  4 SRD5A1cp- UUACGUAUUCAAAUmAmAmG*mC*mC*mU*mC asiRNA AS  48(7, 4)  5 SRD5A1cp- mUUmCCmAAmUGmGCmGCmUU*mC*U* asiRNA S  cholesterol 49  6 SRD5A1cp- AGAAGCGCCAUUGGmAmAA*G*C*U*U asiRNA AS  49(2, 4)  7 SRD5A1cp- AGAAGCGCCAUUGGmAmAmA*mG*C*U*U asiRNA AS  49(4, 4)  8 SRD5A1cp- AGAAGCGCCAUUGGmAmAmA*mG*mC*mU*mU asiRNA AS  49(7, 4)  9 SRD5A1cp- mCUmAAmUCmUUmCCmUUmCU*mA*A* asiRNA S  cholesterol 69 10 SRD5A1cp- UUAGAAGGAAGAUUmAmGC*U*A*U*G asiRNA AS  69(2, 4) 11 SRD5A1cp- UUAGAAGGAAGAUUmAmGmC*mU*A*U*G asiRNA AS  69(4, 4) 12 SRD5A1cp- UUAGAAGGAAGAUUmAmGmC*mU*mA*mU*mG asiRNA AS  69(7, 4) 13 SRD5A1cp- mAUmAUmCCmUAmCUmGUmGU*mA*A* asiRNA S  cholesterol 86 14 SRD5A1cp- UUACACAGUAGGAUmAmUU*C*A*A*C asiRNA AS  86(2, 4) 15 SRD5A1cp- UUACACAGUAGGAUmAmUmU*mC*A*A*C asiRNA AS  86(4, 4) 16 SRD5A1cp- UUACACAGUAGGAUmAmUmU*mC*mA*mA*mC asiRNA AS  86(7, 4) m: 2′-O-Methyl/RNA *: phosphorothioated bond

[Example 4] Screening for Cp-asiRNA Targeting SRD5A1 Gene and Having Self Cell-Penetrating Ability

The inhibitory effects of the 12 kinds of cp-asiRNA shown in Table 2 against SRD5A1 expression were examined. A HuH-7 cell line was incubated with 1 μM or 3 μM of 12 kinds of cp-asiRNA in Opti-MEM media for 24 hours, and then the media were replaced with Dulbecco's Modified Eagle's Medium (Gibco) containing 10% fetal bovine serum (Gibco) and 100 units/ml penicillin 100 μg/ml streptomycin, and 24 hours after media replacement, SRD5A1 expression was examined at the protein level. As illustrated in FIG. 3, as the result of repeatedly conducting two experiments, it was confirmed that SRD5A1 cp-asiRNA #49(2,4) and #86(7,4) exhibited gene inhibitory efficiency of 50% or higher.

The inhibitory effects of the two selected kinds of cp-asiRNA against SRD5A1 expression were examined in a HuH-7 cell line. The HuH-7 cell line was incubated with 0.3 μM, 1 μM, or 3 μM of each of the two kinds of cp-asiRNA in Opti-MEM media for 24 hours, and then SRD5A1 expression was examined at the mRNA level. As the result of repeatedly conducting four experiments, it was confirmed that SRD5A1 cp-asiRNA #49(2,4) and #86(7,4) exhibited gene inhibitory efficiency of 50% or higher at a concentration of 1 μM or higher (see FIG. 4).

[Example 5] Screening for 112 Kinds of RNAi-Inducing Double-Stranded Nucleic Acid Molecules Targeting SRD5A2

To obtain high-efficiency RNAi-inducing double-stranded nucleic acid molecules targeting SRD5A2, the target sequence of the SRD5A2 gene was selected and then asiRNA was designed. The asiRNA structure is different from that of generally known siRNAs, and thus when the nucleotide sequences of asiRNA are designed using a general siRNA design program, it may be somewhat difficult to design an optimized asiRNA. Therefore, asiRNA was constructed by the following method. An NCBI db search was used to obtain information on the SRD5A2 gene (mRNA Accession Number: NM_000348.3) which is thought to target male pattern hair loss (androgenetic hair loss). For subsequent animal experiments, nucleotide sequences with at least 80% homology to that of mice were secured, and then 100 kinds of asiRNA were designed according to a design method such as the exclusion of sequences having a GC content of 30-62% and 4 or more G or C consecutive bases, and then synthesized by OliX Inc. (Korea). The synthesized sense and antisense strand RNA oligonucleotides were annealed at 95° C. for 2 minutes through incubation at 37° C. for 1 hour, and the asiRNA annealed by 10% polyacrylamide gel electrophoresis (PAGE) was confirmed using a UV transilluminator.

TABLE 3 112 strands of asiRNA nucleotide sequences targeting 3-oxo-5-alpha-steroid 4- dehydrogenase 2 112 kinds Sequence (5′-3′) No. Name S AS   1 asiSRD5A2  GUUCCUGCAGGAGCUG CAGCUCCUGCAGGAACCAGGC 1 (SEQ ID NO: 201) (SEQ ID NO: 313)   2 asiSRD5A2  UUCCUGCAGGAGCUGC GCAGCUCCUGCAGGAACCAGG 2 (SEQ ID NO: 202) (SEQ ID NO: 314)   3 asiSRD5A2  UCCUGCAGGASCUGCC GGCAGCUCCUGCAGGAACCAG 3 (SEQ ID NO: 203) (SEQ ID NO: 315)   4 asiSRD5A2  CCUGCAGGAGCUGCCU AGGCAGCUCCUGCAGGAACCA 4 (SEQ ID NO: 204) (SEQ ID NO: 316)   5 asiSRD5A2  CUGCAGGAGCUGCCUU AAGGCAGCUCCUGCAGGAACC 5 (SEQ ID NO: 205) (SEQ ID NO: 317)   6 asiSRD5A2  UGCAGGAGCUGCCUUC GAAGGCAGCUCCUGCAGGAAC 6 (SEQ ID NO: 206) (SEQ ID NO: 318)   7 asiSRD5A2  GCAGGAGCUGCCUUCC GGAAGGCAGCUCCUGCAGGAA 7 (SEQ ID NO: 207) (SEQ ID NO: 319)   8 asiSRD5A2  CAGGAGCUGCCUUCCU AGGAAGGCAGCUCCUGCAGGA 8 (SEQ ID NO: 208) (SEQ ID NO: 320)   9 asiSRD5A2  AGGAGCUGCCUUCCUU AAGGAAGGCAGCUCCUGCAGG 9 (SEQ ID NO: 209) (SEQ ID NO: 321)  10 asiSRD5A2  ACUUCCACAGGACAUU AAUGUCCUGUGGAAGUAAUGU 10 (SEQ ID NO: 210) (SEQ ID NO: 322)  11 asiSRD5A2  CUUCCACAGGACAUUU AAAUGUCCUGUGGAAGUAAUG 11 (SEQ ID NO: 211) (SEQ ID NO: 323)  12 asiSRD5A2  AGGUGGCUUGUUUACG CGUAAACAAGCCACCUUGUGG 12 (SEQ ID NO: 212) (SEQ ID NO: 324)  13 asiSRD5A2  GGUGGCUUGUUUACGU ACGUAAACAAGCCACCUUGUG 13 (SEQ ID NO: 213) (SEQ ID NO: 325)  14 asiSRD5A2  GUGGCUUGUUUACGUA UACGUAAACAAGCCACCUUGU 14 (SEQ ID NO: 214) (SEQ ID NO: 326)  15 asiSRD5A2  UGGCUUGUUUACGUAU AUACGUAAACAAGCCACCUUG 15 (SEQ ID NO: 215) (SEQ ID NO: 327)  16 asiSRD5A2  GGCUUGUUUACGUAUG CAUACGUAAACAAGCCACCUU 16 (SEQ ID NO: 216) (SEQ ID NO: 328)  17 asiSRD5A2  GCUUGUUUACGUAUGU ACAUACGUAAACAAGCCACCU 17 (SEQ ID NO: 217) (SEQ ID NO: 329)  18 asiSRD5A2  CUACCUCAAGAUGUUU AAACAUCUUGAGGUAGAACCU 18 (SEQ ID NO: 218) (SEQ ID NO: 330)  19 asiSRD5A2  GGUUCCUGCAGGAGCU AGCUCCUGCAGGAACCAGGCG 19 (SEQ ID NO: 219) (SEQ ID NO: 331)  20 asiSRD5A2  UACUUCCACAGGACAU AUGUCCUGUGGAAGUAAUGUA 20 (SEQ ID NO: 220) (SEQ ID NO: 332)  21 asiSRD5A2  AGACAUACGGUUUAGC GCUAAACCGUAUGUCUGUGUA 21 (SEQ ID NO: 221) (SEQ ID NO: 333)  22 asiSRD5A2  CAGACAUACGGUUUAG CUAAACCGUAUGUCUGUGUAC 22 (SEQ ID NO: 222) (SEQ ID NO: 334)  23 asiSRD5A2  ACAGACAUACGGUUUA UAAACCGUAUGUCUGUGUACC 23 (SEQ ID NO: 223) (SEQ ID NO: 335)  24 asiSRD5A2  CACAGACAUACGGUUU AAACCGUAUGUCUGUGUACCA 24 (SEQ ID NO: 224) (SEQ ID NO: 336)  25 asiSRD5A2  GGAUUCCACAAGGUGG CCACCUUGUGGAAUCCUGUAG 25 (SEQ ID NO: 225) (SEQ ID NO: 337)  26 asiSRD5A2  GAUUCCACAAGGUGGC GCCACCUUGUGGAAUCCUGUA 26 (SEQ ID NO: 226) (SEQ ID NO: 338)  27 asiSRD5A2  AUUCCACAAGGUGGCU AGCCACCUUGUGGAAUCCUGU 27 (SEQ ID NO: 227) (SEQ ID NO: 339)  28 asiSRD5A2  UUCCACAAGGUGGCUU AAGCCACCUUGUGGAAUCCUG 28 (SEQ ID NO: 228) (SEQ ID NO: 340)  29 asiSRD5A2  UCCACAAGGUGGCUUG CAAGCCACCUUGUGGAAUCCU 29 (SEQ ID NO: 228) (SEQ ID NO: 341)  30 asiSRD5A2  CCACAAGGUGGCUUGU ACAAGCCACCUUGUGGAAUCC 30 (SEQ ID NO: 230) (SEQ ID NO: 342)  31 asiSRD5A2  CACAAGGUGGCUUGUU AACAAGCCACCUUGUGGAAUC 31 (SEQ ID NO: 231) (SEQ ID NO: 343)  32 asiSRD5A2  ACAAGGUGGCUUGUUU AAACAAGCCACCUUGUGGAAU 32 (SEQ ID NO: 232) (SEQ ID NO: 344)  33 asiSRD5A2  CAAGGUGGCUUGUUUA UAAACAAGCCACCUUGUGGAA 33 (SEQ ID NO: 233) (SEQ ID NO: 345)  34 asiSRD5A2  AAGGUGGCUUGUUUAC GUAAACAAGCCACCUUGUGGA 34 (SEQ ID NO: 234) (SEQ ID NO: 346)  35 asiSRD5A2  CUGGAGCCAAUUUCCU AGGAAAUUGGCUCCAGAAACA 35 (SEQ ID NO: 235) (SEQ ID NO: 347)  36 asiSRD5A2  UCUGGAGCCAAUUUCC GGAAAUUGGCUCCAGAAACAU 36 (SEQ ID NO: 236) (SEQ ID NO: 348)  37 asiSRD5A2  UUCUGGAGCCAAUUUC GAAAUUGGCUCCAGAAACAUA 37 (SEQ ID NO: 237) (SEQ ID NO: 349)  38 asiSRD5A2  UUUCUGGAGCCAAUUU AAAUUGGCUCCAGAAACAUAC 38 (SEQ ID NO: 238) (SEQ ID NO: 350)  39 asiSRD5A2  GUUUCUGGAGCCAAUU AAUUGGCUCCAGAAACAUACG 39 (SEQ ID NO: 239) (SEQ ID NO: 351)  40 asiSRD5A2  UGUUUCUGGAGCCAAU AUUGGCUCCAGAAACAUACGU 40 (SEQ ID NO: 240) (SEQ ID NO: 352)  41 asiSRD5A2  AUGUUUCUGGAGCCAA UUGGCUCCAGAAACAUACGUA 41 (SEQ ID NO: 241) (SEQ ID NO: 353)  42 asiSRD5A2  UAUGUUUCUGGAGCCA UGGCUCCAGAAACAUACGUAA 42 (SEQ ID NO: 242) (SEQ ID NO: 354)  43 asiSRD5A2  GUAUGUUUCUGGAGCC GGCUCCAGAAACAUACGUAAA 43 (SEQ ID NO: 243) (SEQ ID NO: 355)  44 asiSRD5A2  GCUCCAGAAACAUACG GCUCCAGAAACAUACGUAAAC 44 (SEQ ID NO: 244) (SEQ ID NO: 356)  45 asiSRD5A2  CAUAGGUUCUACCUCA UGAGGUAGAACCUAUGGUCGU 45 (SEQ ID NO: 245) (SEQ ID NO: 357)  46 asiSRD5A2  AUAGGUUCUACCUCAA UUGAGGUAGAACCUAUGGUGG 46 (SEQ ID NO: 246) (SEQ ID NO: 358)  47 asiSRD5A2  UAGGUUCUACCUCAAG CUUGAGGUAGAACCUAUGGUG 47 (SEQ ID NO: 247) (SEQ ID NO: 359)  48 asiSRD5A2  AGGUUCUACCUCAAGA UCUUGAGGUAGAACCUAUGGU 48 (SEQ ID NO: 248) (SEQ ID NO: 360)  49 asiSRD5A2  GGUUCUACCUCAAGAU AUCUUGAGGUAGAACCUAUGG 49 (SEQ ID NO: 249) (SEQ ID NO: 361)  50 asiSRD5A2  GUUCUACCUCAAGAUG CAUCUUGAGGUAGAACCUAUG 50 (SEQ ID NO: 250) (SEQ ID NO: 362)  51 asiSRD5A2  UUCUACCUCAAGAUGU ACAUCUUGAGGUAGAACCUAU 51 (SEQ ID NO: 251) (SEQ ID NO: 363)  52 asiSRD5A2  UCUACCUCAAGAUGUU AACAUCUUGAGGUAGAACCUA 52 (SEQ ID NO: 252) (SEQ ID NO: 364)  53 asiSRD5A2  CAAAUCUCGGAAAGCC GGCUUUCCGAGAUUUGGGGUA 53 (SEQ ID NO: 253) (SEQ ID NO: 365)  54 asiSRD5A2  AAAUCUCGGAAAGCCC GGGCUUUCCGAGAUUUGGGGU 54 (SEQ ID NO: 254) (SEQ ID NO: 366)  55 asiSRD5A2  AAUCUCGGAAAGCCCU AGGGCUUUCCGAGAUUUGGGG 55 (SEQ ID NO: 255) (SEQ ID NO: 367)  56 asiSRD5A2  GCCCUUAUUCCAUUCA UGAAUGGAAUAAGGGCUUUCC 56 (SEQ ID NO: 256) (SEQ ID NO: 368)  57 asiSRD5A2 CCCUUAUUCCAUUCAU AUGAAUGGAAUAAGGGCUUUC 57 (SEQ ID NO: 257) (SEQ ID NO: 369)  58 asiSRD5A2  CCUUAUUCCAUUCAUC GAUGAAUGGAAUAAGGGCUUU 58 (SEQ ID NO: 258) (SEQ ID NO: 370)  59 asiSRD5A2  CUUAUUCCAUUCAUCU AGAUGAAUGGAAUAAGGGCUU 59 (SEQ ID NO: 259) (SEQ ID NO: 371)  60 asiSRD5A2  UUAUUCCAUUCAUCUU AAGAUGAAUGGAAUAAGGGCU 60 (SEQ ID NO: 260) (SEQ ID NO: 372)  61 asiSRD5A2  UAUUCCAUUCAUCUUU AAAGAUGAAUGGAAUAAGGGC 61 (SEQ ID NO: 261) (SEQ ID NO: 373)  62 asiSRD5A2  AUUCCAUUCAUCUUUU AAAAGAUGAAUGGAAUAAGGG 62 (SEQ ID NO: 262) (SEQ ID NO: 374)  63 asiSRD5A2  UUCCAUUCAUCUUUUA UAAAAGAUGAAUGGAAUAAGG 63 (SEQ ID NO: 263) (SEQ ID NO: 375)  64 asiSRD5A2  UCCAUUCAUCUUUUAA UUAAAAGAUGAAUGGAAUAAG 64 (SEQ ID NO: 264) (SEQ ID NO: 376)  65 asiSRD5A2  UCUCACUUUGUUUCCU AGGAAACAAAGUGAGAAAAAU 65 (SEQ ID NO: 265) (SEQ ID NO: 377)  66 asiSRD5A2  UUCUCACUUUGUUUCC GGAAACAAAGUGAGAAAAAUG 66 (SEQ ID NO: 266) (SEQ ID NO: 378)  67 asiSRD5A2  UUUCUCACUUUGUUUC GAAACAAAGUGAGAAAAAUGC 67 (SEQ ID NO: 267) (SEQ ID NO: 379)  68 asiSRD5A2  UUUUCUCACUUUGUUU AAACAAAGUGAGAAAAAUGCA 68 (SEQ ID NO: 268) (SEQ ID NO: 380)  69 asiSRD5A2  UUUUUCUCACUUUGUU AACAAAGUGAGAAAAAUGCAA 69 (SEQ ID NO: 269) (SEQ ID NO: 381)  70 asiSRD5A2  AUUUUUCUCACUUUGU ACAAAGUGAGAAAAAUGCAAA 70 (SEQ ID NO: 270) (SEQ ID NO: 382)  71 asiSRD5A2  UGGCAGGCAGCGCCAC GUGGCGCUGCCUGCCAGCACU 71 (SEQ ID NO: 271) (SEQ ID NO: 363)  72 asiSRD5A2  CUGGCAGGCAGCGCCA UGGCGCUGCCUGCCAGCACUG 72 (SEQ ID NO: 272) (SEQ ID NO: 384)  73 asiSRD5A2  GGCAGGCAGCGCCACU AGUGGCGCUGCCUGCCAGCAC 73 (SEQ ID NO: 273) (SEQ ID NO: 385)  74 asiSRD5A2  UGCCAGCCCGCGCCGC GCGGCGCGGGCUGGCAGGCGG 74 (SEQ ID NO: 274) (SEQ ID NO: 386)  75 asiSRD5A2  UUACUUCCACAGGACA UGUCCUGUGGAAGUAAUGUAG 75 (SEQ ID NO: 275) (SEQ ID NO: 387)  76 asiSRD5A2  GUGGAAGUAAUGUAGG CCUACAUUACUUCCACAGGAC 76 (SEQ ID NO: 276) (SEQ ID NO: 388)  77 asiSRD5A2  CCCUGAUGGGUGGUAC GUACCACCCAUCAGGGUAUUC 77 (SEQ ID NO: 277) (SEQ ID NO: 389)  78 asiSRD5A2  CCUGAUGGGUGGUACA UGUACCACCCAUCAGGGUAUU 78 (SEQ ID NO: 278) (SEQ ID NO: 390)  79 asiSRD5A2  CUGAUGGGUGGUACAC GUGUACCACCCAUCAGGGUAU 79 (SEQ ID NO: 279) (SEQ ID NO: 391)  80 asiSRD5A2  UGAUGGGUGGUACACA UGUGUACCACCCAUCAGGGUA 80 (SEQ ID NO: 280) (SEQ ID NO: 392)  81 asiSRD5A2  GAUGGGUGGUACACAG CUGUGUACCACCCAUCAGGGU 81 (SEQ ID NO: 281) (SEQ ID NO: 393)  82 asiSRD5A2  AUGGGUGGUACACAGA UCUGUGUACCACCCAUCAGGG 82 (SEQ ID NO: 282) (SEQ ID NO: 394)  83 asiSRD5A2  UGGGUGGUACACAGAC GUCUGUGUACCACCCAUCAGG 83 (SEQ ID NO: 283) (SEQ ID NO: 395)  84 asiSRD5A2  GGGUGGUACACAGACA UGUCUGUGUACCACCCAUCAG 84 (SEQ ID NO: 284) (SEQ ID NO: 396)  85 asiSRD5A2  GGUGGUACACAGACAU AUGUCUGUGUACCACCCAUCA 85 (SEQ ID NO: 285) (SEQ ID NO: 397)  86 asiSRD5A2  GACAUACGGUUUAGCU AGCUAAACCGUAUGUCUGUGU 86 (SEQ ID NO: 286) (SEQ ID NO: 390)  87 asiSRD5A2  CUUGGGUGUCUUCUUA UAAGAAGACACCCAAGCUAAA 87 (SEQ ID NO: 287) (SEQ ID NO: 399)  88 asiSRD5A2  GCUUGGGUGUCUUCUU AAGAAGACACCCAAGCUAAAC 88 (SEQ ID NO: 288) (SEQ ID NO: 400)  89 asiSRD5A2  AGCUUGGGUGUCUUCU AGAAGACACCCAAGCUAAACC 89 (SEQ ID NO: 289) (SEQ ID NO: 401)  90 asiSRD5A2  UAGCUUGGGUGUCUUC GAAGACACCCAAGCUAAACCG 90 (SEQ ID NO: 290) (SEQ ID NO: 402)  91 asiSRD5A2  GCCAGCUCAGGAAGCC GGCUUCCUGAGCUGGCGCAAU 91 (SEQ ID NO: 291) (SEQ ID NO: 403)  92 asiSRD5A2  CGCCAGCUCAGGAAGC GCUUCCUGAGCUGGCGCAAUA 92 (SEQ ID NO: 292) (SEQ ID NO: 404)  93 asiSRD5A2  GCGCCAGCUCAGGAAG CUUCCUGAGCUGGCGCAAUAU 93 (SEQ ID NO: 293) (SEQ ID NO: 405)  94 asiSRD5A2  UGGAGCCAAUUUCCUC GAGGAAAUUGGCUCCAGAAAC 94 (SEQ ID NO: 294) (SEQ ID NO: 406)  95 asiSRD5A2  CUCACUUUGUUUCCUU AAGGAAACAAAGUGAGAAAAA 95 (SEQ ID NO: 295) (SEQ ID NO: 407)  96 asiSRD5A2  CAUUUUUCUCACUUUG CAAAGUGAGAAAAAUGCAAAU 96 (SEQ ID NO: 296) (SEQ ID NO: 408)  97 asiSRD5A2  CCAUAGGUUCUACCUC GAGGUAGAACCUAUGGUGGUG 97 (SEQ ID NO: 297) (SEQ ID NO: 409)  98 asiSRD5A2  ACCAUAGGUUCUACCU AGGUAGAACCUAUGGUGGUGA 98 (SEQ ID NO: 298) (SEQ ID NO: 410)  99 asiSRD5A2  CACCAUAGGUUCUACC GGUAGAACCUAUGGUGGUGAA 99 (SEQ ID NO: 299) (SEQ ID NO: 411) 100 asiSRD5A2  CCACCAUAGGUUCUAC GUAGAACCUAUGGUGGUGAAA 100 (SEQ ID NO: 300) (SEQ ID NO: 412) 101 asiSRD5A2  ACCACCAUAGGUUCUA UAGAACCUAUGGUGGUGAAAA 101 (SEQ ID NO: 301) (SEQ ID NO: 413) 102 asiSRD5A2  CACCACCAUAGGUUCU AGAACCUAUGGUGGUGAAAAG 102 (SEQ ID NO: 302) (SEQ ID NO: 414) 103 asiSRD5A2  GGACUACCCCAAAUCU AGAUUUGGGGUAGUCCUCAAA 103 (SEQ ID NO: 303) (SEQ ID NO: 415) 104 asiSRD5A2  AGGACUACCCCAAAUC GAUUUGGGGUAGUCCUCAAAC 104 (SEQ ID NO: 304) (SEQ ID NO: 416) 105 asiSRD5A2  GAGGACUACCCCAAAU AUUUGGGGUAGUCCUCAAACA 105 (SEQ ID NO: 305) (SEQ ID NO: 417) 106 asiSRD5A2  UGAGGACUACCCCAAA UUUGGGGUAGUCCUCAAACAU 106 (SEQ ID NO: 306) (SEQ ID NO: 418) 107 asiSRD5A2  UUGAGGACUACCCCAA UUGGGGUAGUCCUCAAACAUC 107 (SEQ ID NO: 307) (SEQ ID NO: 419) 108 asiSRD5A2  UUUGAGGACUACCCCA UGGGGUAGUCCUCAAACAUCU 108 (SEQ ID NO: 308) (SEQ ID NO: 420) 109 asiSRD5A2  CCAAAUCUCGGAAAGC GCUUUCCGAGAUUUGGGGUAG 109 (SEQ ID NO: 309) (SEQ ID NO: 421) 110 asiSRD5A2  AGCCCUUAUUCCAUUC GAAUGGAAUAAGGGCUUUCCG 110 (SEQ ID NO: 310) (SEQ ID NO: 422) 111 asiSRD5A2  AAGCCCUUAUUCCAUU AAUGGAAUAAGGGCUUUCCGA 111 (SEQ ID NO: 311) (SEQ ID NO: 423) 112 asiSRD5A2  GGCUAUGCCCUGGCCA UGGCCAGGGCAUAGCCGAUCC 112 (SEQ ID NO: 312) (SEQ ID NO: 424)

[Example 6] Screening for RNAi-Inducing Double-Stranded Nucleic Acid Molecules Targeting SRD5A2

To confirm gene inhibitory efficiency at the mRNA level, 112 selected kinds of asiRNA were transfected into a HuH-7 cell line at a concentration of 0.3 nM, and qRT-PCR was performed to measure the expression level of SRD5A1 mRNA. The HuH-7 cell line was cultured in Dulbecco's Modified Eagle's Medium (DMEM, Gibco) containing 10% fetal bovine serum (FBS, Gibco) and 100 units/ml of penicillin 100 μg/ml of streptomycin. HuH-7 cells were seeded in a 24-well plate at a density of 5×10⁴ cells/well, and a reverse transfection experiment was conducted using asiRNA (0.3 nM, OliX Inc.) and Lipofectamine 2000 (1 μl/ml, Invitrogen Inc.) in Opti-MEM (a total volume of 500 μl) in accordance with Invitrogen's protocol. After 24 hours, total RNA was extracted using TRIzol (TaKaPa), and then cDNA was synthesized using a high-capacity cDNA reverse transcription kit (Applied Biosystems), and the expression level of the SRD5A2 gene was examined using power SYBR green PCR master Mix (Applied Biosystems), the following primers, and a StepOne real-time PCR system (see FIGS. 5A and 5B).

The nucleotide sequences of the primers used in the experiment are shown in Table 4 below.

TABLE 4 Primer nucleotide sequences Name Sequence (5′-3′) size Human Forward GAG TCA ACG GAT TTG GTC GT 186 GAPDH (SEQ ID NO: 425) Reverse GAC AAG CTT CCC GTT CTC AG (SEQ ID NO: 426) Human Forward TGA ACC TGG GTG GCT TAT GA 242 SRD5A2 (SEQ ID NO: 427) Reverse GAA AGG AAA GTT GCT TGG G (SEQ ID NO: 428)

From the results of screening 112 asiRNAs, the 23 top-ranked asiRNAs (in Table 3, No. 5, 8, 28, 31, 32, 33, 37, 38, 39, 40, 42, 48, 49, 59, 60, 62, 65, 83, 84, 85, 91, 92, and 100) were selected, and western blotting was performed at a concentration of 10 nM. HuH-7 cells were seeded in a 6-well plate at a density of 2.5×10³ cells/well, and then a reverse transfection experiment was conducted using asiRNA and Lipofectamine 2000 (1 μl/ml, Invitrogen Inc.) in Opti-MEM (a total volume of 2 ml) in accordance with Invitrogen's protocol. After 48 hours, the cells were lysed using a mammalian protein extraction buffer (GE healthcare), and then proteins were quantified using a Bradford assay. 10 μg of the protein of each sample was electrophoresed using 12% SDS-PAGE at 80 V for 20 minutes and at 120 V for 1 hour, and then transferred onto a PVDE membrane (Bio-Rad) at 300 mA for 1 hour and 20 minutes. After transfer, the membrane was blocked in 5% skim milk for 1 hour and then allowed to react with SRD5A2 antibody (ABcam, ab124877) at a ratio of 1:2000 for 12 hours. The next day, the resulting membrane was allowed to react with anti-Rabbit HRP (Santa Cruz) at a ratio of 1:10000 for 1 hour, and then the expression levels of the SRD5A2 protein were compared with each other using ChemiDoc (Bio-Rad). In the present experiment, 4 asiRNAs (in Table 3, No. 31, 59, 60, and 62) capable of inhibiting SRD5A2 protein expression by about 50% or higher were selected (see FIGS. 6A and 6B).

[Example 7] 16 Kinds of Cp-asiRNA Targeting SRD5A2 Gene and Having Self Cell-Penetrating Ability

SRD5A2 cp-asiRNAs (total 16 strands) were designed by applying three modification patterns to 4 kinds (in Table 3, No. 31, 59, 60, and 62) of asiRNA targeting SRD5A2 according to the number and position of 2′OMe (methyl), phosphorothioate bonds (PS), and cholesterol, and then synthesized by OliX Inc. (Korea). cp-asiRNA enhances endocytosis efficiency and stability and thus may penetrate through the cell membrane with high efficiency without the aid of a delivery vehicle to thereby inhibit the expression of the target gene. The synthesized sense and antisense strand RNA oligonucleotides were annealed at 95° C. for 2 minutes through incubation at 37° C. for 1 hour, and cp-asiRNAs annealed by 10% polyacrylamide gel electrophoresis (PAGE) were confirmed using a UV transilluminator.

TABLE 5 16 strands of cp-asiRNA nucleotide sequences targeting SRD5A2 No. Name Sequence (5′-->3′)  1 SRD5A2cp- mCAmCAmAGmGUmGCmCUmU*G*mU*U asiRNA cholesterol S 31  2 SRD5A2cp- AACAAGCCACCUUGmUmGG*A*A*U*C asiRNA AS 31(2, 4)  3 SRD5A2cp- AACAAGCCACCUUGmUmSmG*mA*A*U*C asiRNA AS 31(4, 4)  4 SRD5A2cp- AACAAGCCACCUUGmUmGmG*mA*mA*mU*mC asiRNA AS 31(7, 4)  5 SRD5A2cp- mCUmUAmUUmCCmAUMUCmA*U*mC*U asiRNA cholesterol S 59  6 SRD5A2cp- AGAUGAAUGGAAUAmAmGG*G*C*U*U asiRNA AS 59(2, 4)  7 SRD5A2cp- AGAUGAAUGGAAUAmAmGmG*mG*C*U*U asiRNA AS 59(4, 4)  8 SRD5A2cp- AGAUGAAUGGAAUAmAmGmG*mG*mC*mU*mU asiRNA AS 59(7, 4)  9 SRD5A2cp- mUUmAUmUCmCAmUUmCAmU*C*mU*U asiRNA cholesterol S 60 10 SRD5A2cp- AAGAUGAAUGGAAUmAmAG*G*G*C*U asiRNA AS 60(2, 4) 11 SRD5A2cp- AAGAUGAAUGGAAUmAmAmG*mG*G*C*U asiRNA AS 60(4, 4) 12 SRD5A2cp- AAGAUGAAUGGAAUmAmAmG*mG*mG*mC*mU asiRNA AS 60(7, 4) 13 SRD5A2cp- mAUmUCmCAmUUmCAmUC*mU*U*mU*U asiRNA cholesterol S 62 14 SRD5A2cp- AAAAGAUGAAUGGAmAmUA*A*G*G*G asiRNA AS 62(2, 4) 15 SRD5A2cp- AAAAGAUGAAUGGAmAmUmA*mA*G*G*G asiRNA AS 62(4, 4) 16 SRD5A2cp- AAAAGAUGAAUGGAmAmUmA*mA*mG*mG*mG asiRNA AS 62(7, 4) m: 2′-O-Methyl/RNA *: phosphorothioated bond

[Example 8] Screening for Cp-asiRNA Targeting SRD5A2 Gene and Having Self Cell-Penetrating Ability

The inhibitory effects of the 12 kinds of cp-asiRNA shown in Table 5 against SRD5A2 expression were examined. A HuH-7 cell line was incubated with 1 μM or 3 μM of 12 kinds of cp-asiRNA in Opti-MEM media for 24 hours, and then the media were replaced with Dulbecco's Modified Eagle's Medium (Gibco) containing 10% fetal bovine serum (Gibco) and 100 units/ml penicillin 100 μg/ml streptomycin, and 24 hours after media replacement, SRD5A2 expression was examined at the protein level. As the result of repeatedly conducting two experiments, it was confirmed that SRD5A2 cp-asiRNA #59(4,4) and #62(4,4) exhibited gene inhibitory efficiency of 50% or higher (see FIG. 7).

[Example 9] Confirmation of Inhibitory Efficiency of 2 Selected Kinds of Cp-asiRNA Against Target Gene SRD5A2 Expression

The inhibitory effects of the two above-selected kinds of cp-asiRNA against SRD5A2 expression were examined in a HuH-7 cell line. The HuH-7 cell line was incubated in Opti-MEM media with 1.95 nM, 3.9 nM, 7.8 nM, 15.6 nM, 31.3 nM, 62.5 nM, 125 nM, 250 nM, 500 nM, or 1,000 nM of each of the two kinds of cp-asiRNA for 24 hours, and then SRD5A2 expression was examined at the mRNA level. As the result of repeatedly conducting three experiments, it was confirmed that SRD5A2 cp-asiRNA #59(4,4) and #62(4,4) had IC₅₀ values of 22.37 nM and 27.18 nM, respectively (see FIG. 8).

The inhibitory effects of the two above-selected kinds of cp-asiRNA against SRD5A2 expression were examined in a HuH-7 cell line. The HuH-7 cell line was incubated with 0.1 μM, 0.3 μM, 1 μM, or 3 μM of the two kinds of cp-asiRNA in Opti-MEM media for 24 hours, and then the media were replaced with Dulbecco's Modified Eagle's Medium (Gibco) containing 10% fetal bovine serum (Gibco) and 100 units/ml penicillin 100 μg/ml streptomycin, and 24 hours after media replacement, SRD5A2 expression was examined at the protein level. As the result of repeatedly conducting two experiments, it was confirmed that, as the treatment concentrations of cp-asiSRD5A2 #59(4,4) and #62(4,4) increased, the protein expression of the target gene SRD5A2 was reduced (see FIG. 9).

[Example 10] Screening for 118 Kinds of RNAi-Inducing Double-Stranded Nucleic Acid Molecules Targeting AR

To obtain high-efficiency RNAi-inducing double-stranded nucleic acid molecules targeting AR, the target sequence of the AR gene was selected and then asiRNA was designed. The asiRNA structure is different from that of generally known siRNAs, and thus when the nucleotide sequences of asiRNA are designed using a general siRNA design program, it may be somewhat difficult to design an optimized asiRNA. Therefore, asiRNA was constructed by the following method. An NCBI db search was used to obtain information on the AR gene (mRNA Accession Number: NM_001011645.2), which is the target gene pertaining to male pattern hair loss (androgenetic hair loss). For subsequent animal experiments, nucleotide sequences with at least 80% homology to that of mice were secured, and then 100 asiRNAs were designed according to a design method such as the exclusion of sequences having a GC content of 30-62% and 4 or more G or C consecutive bases, and then synthesized by OliX Inc. (Korea). The synthesized sense and antisense strand RNA oligonucleotides were annealed at 95° C. for 2 minutes through incubation at 37° C. for 1 hour, and the asiRNA annealed by 10% polyacrylamide gel electrophoresis (PAGE) was confirmed using a UV transilluminator.

TABLE 6 118 strands of asiRNA nucleotide sequences targeting androgen receptor Sequence (5′-3′) No. Name S (16mer) As (21mer)   1 asiAR1 GAGAUGAAGCUUCUGG CCAGAAGCUUCAUCUCCACAG (SEQ ID NO: 429) (SEQ ID NO: 547)   2 asiAR2 GGAGAUGAAGCUUCUG CAGAAGCUUCAUCUCCACAGA (SEQ ID NO: 430) (SEQ ID NO: 548)   3 asiAR3 GUGGAGAUGAAGCUUC GAAGCUUCAUCUCCACAGAUC (SEQ ID NO: 431) (SEQ ID NO: 549)   4 asiAR4 UGUGGAGAUGAAGCUU AAGCUUCAUCUCCACAGAUCA (SEQ ID NO: 432) (SEQ ID NO: 550)   5 asiAR5 UCUGUGGAGAUGAAGC GCUUCAUCUCCACAGAUCAGG (SEQ ID NO: 433) (SEQ ID NO: 551)   6 asiAR6 UGAUCUGUGGAGAUGA UCAUCUCCACAGAUCAGGCAG (SEQ ID NO: 434) (SEQ ID NO: 552)   7 asiAR7 CUGAUCUGUGGAGAUG CAUCUCCACAGAUCAGGCAGG (SEQ ID NO: 435) (SEQ ID NO: 553)   8 asiAR8 AAGACCUGCCUGAUCU AGAUCAGGCAGGUCUUCUGGG (SEQ ID NO: 436) (SEQ ID NO: 554)   9 asiAR9 UUUCCACCCCAGAAGA UCUUCUGGGGUGGAAAGUAAU (SEQ ID NO: 437) (SEQ ID NO: 555)  10 asiAR10 ACUUUCCACCCCAGAA UUCUGGGGUGGAAAGUAAUAG (SEQ ID NO: 438) (SEQ ID NO: 556)  11 asiAR11 AAGGGAAACAGAAGUA UACUUCUGUUUCCCUUCAGCG (SEQ ID NO: 439) (SEQ ID NO: 557)  12 asiAR12 GAAGGGAAACAGAAGU ACUUCUGUUUCCCUUCAGCGG (SEQ ID NO: 440) (SEQ ID NO: 558)  13 asiAR13 CUGAAGGGAAACAGAA UUCUGUUUCCCUUCAGCGGCU (SEQ ID NO: 441) (SEQ ID NO: 559)  14 asiAR14 CAAAAGAGCCGCUGAA UUCAGCGGCUCUUUUGAAGAA (SEQ ID NO: 442) (SEQ ID NO: 560)  15 asiAR15 UCAAAAGAGCCGCUGA UCAGCGGCUCUUUUGAAGAAG (SEQ ID NO: 443) (SEQ ID NO: 561)  16 asiAR16 CUUCAAAAGAGCCGCU AGCGGCUCUUUUGAAGAAGAC (SEQ ID NO: 444) (SEQ ID NO: 562)  17 asiSR17 CUUCUUCAAAAGAGCC GGCUCUUUUGAAGAAGACCUU (SEQ ID NO: 445) (SEQ ID NO: 563)  18 asiAR18 UCUUCUUCAAAAGAGC GCUCUUUUGAAGAAGACCUUG (SEQ ID NO: 446) (SEQ ID NO: 564)  19 asiAR19 AGGUCUUCUUCAAAAG CUUUUGAAGAAGACCUUGCAG (SEQ ID NO: 447) (SEQ ID NO: 565)  20 asiAR20 AACCAGGGAUGACUCU AGAGUCAUCCCUGCUUCAUAA (SEQ ID NO: 448) (SEQ ID NO: 566)  21 asiAR21 UGAAGCAGGGAUGACU AGUCAUCCCUGCUUCAUAACA (SEQ ID NO: 449) (SEQ ID NO: 567)  22 asiAR22 UUAUGAAGCAGGGAUG CAUCCCUGCUUCAUAACAUUU (SEQ ID NO: 450) (SEQ ID NO: 568)  23 asiAR23 UGUUAUGAAGCAGGGA UCCCUGCUUCAUAACAUUUCC (SEQ ID NO: 451) (SEQ ID NO: 569)  24 asiAR24 AUGUUAUGAAGCAGGG CCCUGCUUCAUAACAUUUCCG (SEQ ID NO: 452) (SEQ ID NO: 570)  25 asiAR25 GCUAUGAAUGUCAGCC GGCUGACAUUCAUAGCCUUCA (SEQ ID NO: 453) (SEQ ID NO: 571)  26 asiAR26 GGCUAUGAAUGUCAGC GCUGACAUUCAUAGCCUUCAA (SEQ ID NO: 454) (SEQ ID NO: 572)  27 asiAR27 GAAGGCUAUGAAUGUC GACAUUCAUAGCCUUCAAUGU (SEQ ID NO: 455) (SEQ ID NO: 573)  28 asiAR28 UUGAAGGCUAUGAAUG CAUUCAUAGCCUUCAAUGUGU (SEQ ID NO: 456) (SEQ ID NO: 574)  29 asiAR29 GAAGCCAUUGAGCCAG CUGGCUCAAUGGCUUCCAGGA (SEQ ID NO: 457) (SEQ ID NO: 575)  30 asiAR30 CUGGCUUCCGCAACUU AAGUUGCGGAAGCCAGGCAAG (SEQ ID NO: 458) (SEQ ID NO: 576)  31 asiAR31 UGCCUGGCUUCCGCAA UUGCGGAAGCCAGGCAAGGCC (SEQ ID NO: 459) (SEQ ID NO: 577)  32 asiAR32 AGUGGGCCAAGGCCUU AAGGCCUUGGCCCACUUGACC (SEQ ID NO: 460) (SEQ ID NO: 578)  33 asiAR33 CCAGGAUGCUCUACUU AAGUAGAGCAUCCUGGAGUUG (SEQ ID NO: 481) (5E0 ID NO: 579)  34 asiAR34 UCCAGGAUGCUCUACU AGUAGAGCAUCCUGGAGUUGA (SEQ ID NO: 462) (SEQ ID NO: 580)  35 asiAR35 AACUCCAGGAUGCUCU AGAGCAUCCUGGAGUUGACAU (SEQ ID NO: 463) (SEQ ID NO: 581)  36 asiAR36 UACCGCAUGCACAAGU ACUUGUGCAUGCGGUACUCAU (SEQ ID NO: 464) (SEQ ID NO: 582)  37 asiAR37 AGUACCGCAUGCACAA UUGUGCAUGCGGUACUCAUUG (SEQ ID NO: 465) (SEQ ID NO: 583)  38 asiAR38 CAAUGAGUACCGCAUG CAUGCGGUACUCAUUGAAAAC (SEQ ID NO: 466) (SEQ ID NO: 594)  39 asiAR39 UCAAUGAGUACCGCAU AUGCGGUACUCAUUGAAAACC (SEQ ID NO: 467) (SEQ ID NO: 585)  40 asiAR40 UUCAAUGAGUACCGCA UGCGGUACUCAUUGAAAACCA (SEQ ID NO: 468) (SEQ ID NO: 586)  41 asiAR41 UUGGAUGGCUCCAAAU AUUUGGAGCCAUCCAAACUCU (SEQ ID NO: 469) (SEQ ID NO: 587)  42 asiAR42 AGUUUGGAUGGCUCCA UGGAGCCAUCCAAACUCCUGA (SEQ ID NO: 470) (SEQ ID NO: 588)  43 asiAR43 AGAGUUUGGAUGGCUC GAGCCAUCCAAACUCUUGAGA (SEQ ID NO: 471) (SEQ ID NO: 589)  44 asiAR44 UCAAGGAACUCGAUCG CGAUCGAGUUCCUUGAUGUAG (SEQ ID NO: 472) (SEQ ID NO: 590)  45 asiAR45 CAUCAAGGAACUCGAU AUCGAGUUCCUUGAUGUAGUU (SEQ ID NO: 473) (SEQ ID NO: 591)  46 asiAR46 CUACAUCAAGGAACUC GAGUUCCUUGAUGUAGUUCAU (SEQ ID NO: 474) (SEQ ID NO: 592)  47 asiAR47 GAACUACAUCAAGGAA UUCCUUGAUGUAGUUCAUUCG (SEQ ID NO: 475) (SEQ ID NO: 593)  48 asiAR48 CUUCGAAUGAACUACA UGUAGUUCAUUCGAAGUUCAU (SEQ ID NO: 476) (SEQ ID NO: 594)  49 asiAR49 UGAACUUCGAAUGAAC GUUCAUUCGAAGUUCAUCAAA (SEQ ID NO: 477) (SEQ ID NO: 595)  50 asiAR50 UGAUGAACUUCGAAUG CAUUCGAAGUUCAUCAAAGAA (SEQ ID NO: 478) (SEQ ID NO: 596)  51 asiAR51 GGGCUGAAAAAUCAAA UUUGAUUUUUCAGCCCAUCCA (SEQ ID NO: 479) (SEQ ID NO: 597)  52 asiAR52 GAUGGGCUGAAAAAUC GAUUUUUCAGCCCAUCCACUG (SEQ ID NO: 480) (SEQ ID NO: 598)  53 asiAR53 UAUUCCAGUGGAUGGG CCCAUCCACUGGAAUAAUGCU (SEQ ID NO: 481) (SEQ ID NO: 599)  54 asiAR54 CAUUAUUCCAGUGGAU AUCCACUGGAAUAAUGCUGAA (SEQ ID NO: 482) (SEQ ID NO: 600)  55 asiAR55 AGCAUUAUUCCAGUGG CCACUGGAAUAAUGCUGAAGA (SEQ ID NO: 483) (SEQ ID NO: 601)  56 asiAR56 UUCAGCAUUAUUCCAG CUGGAAUAAUGCUGAAGAGAG (SEQ ID NO: 484) (SEQ ID NO: 602)  57 asiAR57 CUCUUCAGCAUUAUUC GAAUAAUGCUGAAGAGAGCAG (SEQ ID NO: 485) (SEQ ID NO: 603)  58 asiAR58 CUGCUCUCUUCAGCAU AUGCUGAAGAGAGCAGUGCUU (SEQ ID NO: 486) (SEQ ID NO: 604)  59 asiAR59 AAGCACUGCUCUCUUC GAAGAGAGCAGUGCUUUCAUG (SEQ ID NO: 487) (SEQ ID NO: 605)  60 asiAR60 GAAAGCACUGCUCUCU AGAGAGCAGUGCUUUCAUGCA (SEQ ID NO: 488) (SEQ ID NO: 606)  61 asiAR61 CAUGAAAGCACUGCUC GAGCAGUGCUUUCAUGCACAG (SEQ ID NO: 489) (SEQ ID NO: 607)  62 asiAR62 GUGCAUGAAAGCACUG CAGUGCUUUCAUGCACAGGAA (SEQ ID NO: 490) (SEQ ID NO: 608)  63 asiAR63 UUCCUGUGCAUGAAAG CUUUCAUGCACAGGAAUUCCU (SEQ ID NO: 491) (SEQ ID NO: 609)  64 asiAR64 GAAUUCCUGUGCAUGA UCAUGCACAGGAAUUCCUGGG (SEQ ID NO: 492) (SEQ ID NO: 610)  65 asiAR65 AGGAAUUCCUGUGCAU AUGCACAGGAAUUCCUGGGGG (SEQ ID NO: 493) (SEQ ID NO: 611)  66 asiAR66 UCACCAAGCUCCUGGA UCCAGGAGCUUGGUGAGCUGG (SEQ ID NO: 494) (SEQ ID NO: 612)  67 asiAR67 ACCAGCUCACCAAGCU AGCUUGGUGAGCUGGUAGAAG (SEQ ID NO: 495) (SEQ ID NO: 613)  68 asiAR68 CUACCAGCUCACCAAG CUUGGUGAGCUGGUAGAAGCG (SEQ ID NO: 496) (SEQ ID NO: 614)  69 asiAR69 ACCUGCUAAUCAAGUC GACUUGAUUAGCAGGUCAAAA (SEQ ID NO: 497) (SEQ ID NO: 615)  70 asiAR70 GACCUGCUAAUCAAGU ACUUGAUUAGCAGGUCAAAAG (SEQ ID NO: 498) (SEQ ID NO: 616)  71 asiAR71 UUUGACCUGCUAAUCA UGAUUAGCAGGUCAAAAGUGA (SEQ ID NO: 499) (SEQ ID NO: 617)  72 asiAR72 CUUUUGACCUGCUAAU AUUAGCAGGUCAAAAGUGAAC (SEQ ID NO: 500) (SEQ ID NO: 618)  73 asiAR73 UCACUUUUGACCUGCU AGCAGGUCAAAAGUGAACUGA (SEQ ID NO: 501) (SEQ ID NO: 619)  74 asiAR74 UUCACUUUUGACCUGC GCAGGUCAAAAGUGAACUGAU (SEQ ID NO: 502) (SEQ ID NO: 620)  75 asiAR75 CAGUUCACUUUUGACC GGUCAAAAGUGAACUGAUGCA (SEQ ID NO: 503) (SEQ ID NO: 621)  76 asiAR76 CAUCAGUUCACUUUUG CAAAAGUGAACUGAUGCAGCU (SEQ ID NO: 504) (SEQ ID NO: 622)  77 asiAR77 CUGCAUCAGUUCACUU AAGUGAACUGAUGCAGCUCUC (SEQ ID NO: 505) (SEQ ID NO: 623)  78 asiAR78 GCUGCAUCAGUUCACU AGUGAACUGAUGCAGCUCUCU (SEQ ID NO: 506) (SEQ ID NO: 624)  79 asiAR79 CCAUCUAUUUCCACAC GUGUGGAAAUAGAUGGGCUUG (SEQ ID NO: 507) (SEQ ID NO: 625)  80 asiAR80 CCCAUCUAUUUCCACA UGUGGAAAUAGAUGGGCUUGA (SEQ ID NO: 508) (SEQ ID NO: 626)  81 asiAR81 AGCCCAUCUAUUUCCA UGGAAAUAGAUGGGCUUGACU (SEQ ID NO: 509) (SEQ ID NO: 627)  82 asiAR82 UCAAGCCCAUCUAUUU AAAUAGAUGGGCUUGACUUUC (SEQ ID NO: 510) (SEQ ID NO: 628)  83 asiAR83 GGAAAGUCAAGCCCAU AUGGGCUUGACUUUCCCAGAA (SEQ ID NO: 511) (SEQ ID NO: 629)  84 asiAR84 CUGGGAAAGUCAAGCC GGCUUGACUUUCCCAGAAAGG (SEQ ID NO: 512) (SEQ ID NO: 630)  85 asiAR85 UUUCUGGGAAAGUCAA UUGACUUUCCCAGAAAGGAUC (SEQ ID NO: 513) (SEQ ID NO: 631)  86 asiAR86 UCCUUUCUGGGAAAGU ACUUUCCCAGAAAGGAUCUUG (SEQ ID NO: 514) (SEQ ID NO: 632)  87 asiAR87 CCAAGAUCCUUUCUGG CCAGAAAGGAUCUUGGGCACU (SEQ ID NO: 515) (SEQ ID NO: 633)  88 asiAR88 UGCCCAAGAUCCUUUC GAAAGGAUCUUGGGCACUUGC (SEQ ID NO: 516) (SEQ ID NO: 634)  89 asiAR89 AAGUGCCCAAGAUCCU AGGAUCUUGGGCACUUGCACA (SEQ ID NO: 517) (SEQ ID NO: 635)  90 asiAR90 UGCAAGUGCCCAAGAU AUCUUGGGCACUUGCACAGAG (SEQ ID NO: 518) (SEQ ID NO: 636)  91 asiAR91 UCUCUGUGCAAGUGCC GGCACUUGCACAGAGAUGAUC (SEQ ID NO: 519) (SEQ ID NO: 637)  92 asiAR92 UCAUCUCUGUGCAAGU ACUUGCACAGAGAUGAUCUCU (SEQ ID NO: 520) (SEQ ID NO: 636)  93 asiAR93 AGAUCAUCUCUGUGCA UGCACAGAGAUGAUCUCUGCC (SEQ ID NO: 521) (SEQ ID NO: 639)  94 asiAR94 CAGAGAUCAUCUCUGU ACAGAGAUGAUCUCUGCCAUC (SEQ ID NO: 522) (SEQ ID NO: 640)  95 asiAR95 CACUGGCACUAAAAAA UUUUUUAGUGCCAGUGAACAU (SEQ ID NO: 523) (SEQ ID NO: 641)  96 asiAR96 UCACUGGCACUAAAAA UUUUUAGUGCCAGUGAACAUA (SEQ ID NO: 524) (SEQ ID NO: 642)  97 asiAR97 GUUCACUGGCACUAAA UUUAGUGCCAGUGAACAUACA (SEQ ID NO: 525) (SEQ ID NO: 643)  98 asiAR98 UAUGUUCACUGGCACU AGUGCCAGUGAACAUACAUAA (SEQ ID NO: 526) (SEQ ID NO: 644)  99 asiAR99 UGUAUGUUCACUGGCA UGCCAGUGAACAUACAUAAAA (SEQ ID NO: 527) (SEQ ID NO: 645) 100 asiAR100 UAUGUAUGUUCACUGG CCAGUGAACAUACAUAAAAAU (SEQ ID NO: 528) (SEQ ID NO: 646) 101 asiAR101 GGGUAGUUGCUGAGGU ACCUCAGCAACUACCCAAAGG (SEQ ID NO: 529) (SEQ ID NO: 647) 102 asiAR102 UGGGUAGUUGCUGAGG CCUCAGCAACUACCCAAAGGA (SEQ ID NO: 530) (SEQ ID NO: 648) 103 asiAR103 CUUUGGGUAGUUGCUG CAGCAACUACCCAAAGGACAG (SEQ ID NO: 531) (SEQ ID NO: 649) 104 asiAR104 CCUUUGGGUAGUUGCU AGCAACUACCCAAAGGACAGA (SEQ ID NO: 532) (SEQ ID NO: 650) 105 asiAR105 CCACCAUCCACAUGAU AUCAUGUGGAUGGUGGACAUA (SEQ ID NO: 533) (SEQ ID NO: 651) 106 asiAR106 CAUUAGUGCCUCUUUG CAAAGAGGCACUAAUGCUUGC (SEQ ID NO: 534) (SEQ ID NO: 652) 107 asiAR107 GCAUUAGUGCCUCUUU AAAGAGGCACUAAUGCUUGCU (SEQ ID NO: 535) (SEQ ID NO: 653) 108 asiAR108 AGCAUUAGUGCCUCUU AAGAGGCACUAAUGCUUGCUC (SEQ ID NO: 536) (SEQ ID NO: 654) 109 asiAR109 AAGCAUUAGUGCCUCU AGAGGCACUAAUGCUUGCUCC (SEQ ID NO: 537) (SRI ID NO: 655) 110 asiAR110 GCCCAUGUUAGCUUAU AUAAGCUAACAUGGGCACUAG (SEQ ID NO: 538) (SEQ ID NO: 656) 111 asiAR111 GAAACUUGUUUGUUGG CCAACAAACAAGUUUCUGCCA (SEQ ID NO: 539) (SEQ ID NO: 657) 112 asiAR112 GCAGAAACUUGUUUGU ACAAACAAGUUUCUGCCAUUU (SEQ ID NO: 540) (SEQ ID NO: 658) 113 asiAR113 AUGGCAGAAACUUGUU AACAAGUUUCUGCCAUUUUUA (SEQ ID NO: 541) (SEQ ID NO: 659) 114 asiAR114 AAUGGCAGAAACUUGU ACAAGUUUCUGCCAUUUUUAA (SEQ ID NO: 542) (SEQ ID NO: 660) 115 asiAR115 GGAAUCUUUUGUUGCU AGCAACAAAAGAUUCCAAGAU (SEQ ID NO: 543) (SEQ ID NO: 661) 116 asiAR116 UGGAAUCUUUUGUUGC GCAACAAAAGAUUCCAAGAUU (SEQ ID NO: 544) (SEQ ID NO: 662) 117 asiAR117 UAGUGUUCUGUUCUCU AGAGAACAGAACACUAGCGCU (SEQ ID NO: 545) (SEQ ID NO: 663) 118 asiAR118 CUAGUGUUCUGUUCUC GAGAACAGAACACUAGCGCUU (SEQ ID NO: 546) (SEQ ID NO: 664)

[Example 11] Screening for RNAi-Inducing Double-Stranded Nucleic Acid Molecules Targeting AR

To confirm gene inhibitory efficiency at the mRNA level, the 118 selected asiRNAs were transfected into an A549 cell line at a concentration of 0.3 nM, and qRT-PCR was performed to measure the expression level of AR mRNA.

The A549 cell line was cultured in Dulbecco's Modified Eagle's Medium (DMEM, Gibco) containing 10% fetal bovine serum (FBS, Gibco) and 100 units/ml of penicillin 100 μg/ml of streptomycin. A549 cells were seeded in a 96-well plate at a density of 5×10³ cells/well, and a transfection experiment was conducted using asiRNA (0.3 nM, OliX Pharmaceuticals Inc.) and RNAiMAX (1 μl/ml, Invitrogen Inc.) in Opti-MEM (a total volume of 100 μl) in accordance with Invitrogen's protocol. After 24 hours, RNA purification and cDNA synthesis were performed in accordance with a basic protocol provided by TOYOBO SuperPrep, the expression level of the AR gene was examined with an AR TaqMan probe (T) using a Bio-Rad CFX-4000 machine. First, 88 kinds of asiRNA from among the 118 kinds of asiRNA were subjected to an asiRNA screening experiment and the 13 top-ranked asiRNAs (in Table 6, No. 43, 49, 67, 70, 72, 74, 75, 77, 78, 79, 81, 82, and 87) were selected on the basis of inhibitory efficacy against the expression of the target gene, and the 13 selected asiRNAs and the 30 remaining asiRNAs (in Table 6, Nos. 88 to 118) were subjected to a secondary asiRNA screening experiment (see FIGS. 10A and 10B).

The 20 top-ranked asiRNAs (in Table 6, No. 43, 49, 70, 72, 74, 75, 77, 78, 79, 81, 82, 87, 89, 90, 93, 96, 106, 110, 111, and 118) having gone through secondary asiRNA screening were selected on the basis of inhibitory efficacy against the expression of the target gene, and an experiment for confirming the inhibitory effect of the 20 selected asiRNAs against AR expression at the protein level was performed. A549 cells were seeded in a 12-well plate at a density of 5×10⁴ cells/well, and then a transfection experiment was conducted using asiRNA (0.3 nM, OliX Pharmaceuticals Inc.) and RNAiMAX (1 μl/ml, Invitrogen Inc.) in Opti-MEM (a total volume of 1 ml) in accordance with Invitrogen's protocol. After 48 hours, the cells were lysed using a mammalian protein extraction buffer (GE healthcare), and then proteins were quantified using a Bradford assay. 20 μg of the protein of each sample was electrophoresed using 10% SDS-PAGE at 80 V for 20 minutes and at 120 V for 1 hour, and then transferred onto a PVDE membrane (Bio-Rad) at 300 mA for 1 hour. After transfer, the membrane was blocked in 5% skim milk for 1 hour and allowed to react with AR antibody (ABcam, ab133273) at a ratio of 1:2000 for 12 hours. The next day, the resulting membrane was allowed to react with anti-Rabbit HRP (Santa Cruz) at a ratio of 1:5000 for 1 hour, and then the expression levels of the AR protein were compared with each other using ChemiDoc (Bio-Rad). From the results, the 9 top-ranked asiRNAs (No. 70, 72, 78, 81, 82, 90, 110, 111, and 118) capable of more effectively inhibiting AR protein expression were selected (see FIG. 11).

The 9 top-ranked asiRNA candidates (in Table 6, No. 70, 72, 78, 81, 82, 90, 110, 111, and 118) having gone through asiRNA screening were selected on the basis of inhibitory efficacy against the expression of the target gene, and an experiment for confirming the inhibitory effects of the 9 selected asiRNA candidates against AR expression at the mRNA and protein levels and a lower concentration (0.1 nM) was conducted. A549 cells were seeded in a 12-well plate at a density of 5×10⁴ cells/well, and a transfection experiment was conducted using asiRNA and RNAiMAX (1 μl/ml, Invitrogen Inc.) in Opti-MEM (a total volume of 0.5 ml) in accordance with Invitrogen's protocol. After 48 hours, total RNA was extracted using TRIzol (TaKaPa), and then cDNA was synthesized using a high-capacity cDNA reverse transcription kit (Applied Biosystems), and the expression level of the AR gene was examined using power SYBR green PCR master Mix (Applied Biosystems), the primers shown in Table 7 below, and a StepOne real-time PCR system.

TABLE 7 Primer nucleotide sequences Name Sequence (5′-3′) size Human Forward GAG TCA ACG GAT TTG GTC 186 GAPDH GT (SEQ ID NO: 665) Reverse GAC AAG CTT CCC GTT CTC AG (SEQ ID NO: 666) Human Forward GGG GCT AGA CTG CTC AAC 191 AR TG (SEQ ID NO: 667) Reverse GCC AAG TTT TGG CTG AAG AG (SEQ ID NO: 668)

In addition, A549 cells were seeded in a 12-well plate at a density of 5×10⁴ cells/well, and a transfection experiment was conducted using asiRNA and RNAiMAX (1 μl/ml, Invitrogen Inc.) in Opti-MEM (a total volume of 0.5 ml) in accordance with Invitrogen's protocol. After 48 hours, the cells were lysed using a mammalian protein extraction buffer (GE healthcare), and then proteins were quantified using a Bradford assay. 20 μg of the protein of each sample was electrophoresed using 10% SDS-PAGE at 80 V for 20 minutes and at 120 V for 1 hour, and then transferred onto a PVDE membrane (Bio-Rad) at 300 mA for 1 hour. After transfer, the membrane was blocked in 5% skim milk for 1 hour and allowed to react with AR antibody (ABcam, ab133273) at a ratio of 1:2000 for 12 hours. The next day, the resulting membrane was allowed to react with anti-Rabbit HRP (Santa Cruz) at a ratio of 1:5000 for 1 hour, and then the expression levels of the AR protein were compared with each other using ChemiDoc (Bio-Rad). As the result of the experiment for the 9 selected asiRNAs, it was confirmed that asiRNA #72, 78, and 110 exhibited gene inhibitory efficiency of 50% or higher efficiently even at a concentration of 0.1 nM (see FIG. 12).

[Example 12] 9 Kinds of Cp-asiRNA Targeting AR Gene and Having Self Cell-Penetrating Ability

AR cp-asiRNAs (a total of 9 kinds) were designed by applying three modification patterns to 3 kinds of asiRNA targeting AR according to the number and position of 2′OMe (methyl), phosphorothioate bonds (PS), and cholesterol, and then synthesized by Dharmacon. cp-asiRNA enhances endocytosis efficiency and stability, and thus may penetrate through the cell membrane with high efficiency without the aid of a delivery vehicle to thereby inhibit the expression of the target gene. The synthesized sense and antisense strand RNA oligonucleotides were annealed at 95° C. for 2 minutes through incubation at 37° C. for 1 hour, and cp-asiRNAs annealed by 10% polyacrylamide gel electrophoresis (PAGE) were confirmed using a UV transilluminator.

TABLE 8 9 kinds of cp-asiRNA nucleotide sequences targeting AR No. Name Sequence (5′-3′)  1 cp-asiAR72 mCUmUUmUGmACmCUmGCmUAm*A*U*chol S  2 cp-asiAR72 AUUAGCAGGUCAAAmAmGmU*mG*mA*mA*mC AS(7, 4)  3 cp-asiAR72 AUUAGCAGGUCAAAmAmGmU*mG*A*A*C AS(4, 4)  4 cp-asiAR72 AUUAGCAGGUCAAAmAmGU*G*A*A*C AS(2, 4)  5 cp-asiAR78 mGCmUGmCAmUCmAGmUUmCAm*C*U*chol S  6 cp-asiAR78 AGUGAACUGAUGCAmGmCmU*mC*mU*mC*mU AS(7, 4)  7 cp-asiAR78 AGUGAACUGAUGCAmGmCmU*mC*U*C*U AS(4, 4)  8 cp-asiAR78 AGUGAACUGAUGCAmGmCU*C*U*C*U AS(2, 4)  9 cp-asiAR110 mGCmCCmAUmGUmUAmGCmUUm*A*U*chol S 10 cp-asiAR110 AUAAGCUAACAUGGmGmCmA*mC*mU*mA*mG AS(7, 4) 11 cp-asiAR110 AUAAGCUAACAUGGmGmemA*mC*U*A*G AS(4, 4) 12 cp-asiAR110 AUAAGCUAACAUGGmGmCA*C*U*A*G AS(2, 4) m: 2′-O-Methyl RNA, *: phosphorothioated bond, chol: cholesterol

[Example 13] Screening for Cp-asiRNA Targeting AR Gene and Having Self Cell-Penetrating Ability

The inhibitory effects of the 9 kinds of cp-asiRNA shown in Table 8 against AR expression were examined. An A549 cell line was incubated with 1 μM or 3 μM of each of the 9 cp-asiRNAs in Opti-MEM media for 24 hours, and then the media were replaced with Dulbecco's Modified Eagle's Medium (Gibco) containing 10% fetal bovine serum (Gibco) and 100 units/ml penicillin 100 μg/ml streptomycin, and after 24 hours, AR expression was examined at the mRNA level. As the result of repeatedly conducting four experiments, it was confirmed that the 9 kinds of AR cp-asiRNA exhibited gene inhibitory efficiency of 50% at a concentration of 3 μM (see FIG. 13).

Under the same experimental conditions, the inhibitory effects of the 9 kinds of cp-asiRNA against AR expression were examined at the protein level in an A549 cell line. The A549 cell line was incubated with 1 μM or 3 μM of each of the 9 cp-asiRNAs in Opti-MEM media for 24 hours, and then the media were replaced with Dulbecco's Modified Eagle's Medium (Gibco) containing 10% fetal bovine serum (Gibco) and 100 units/ml penicillin 100 μg/ml streptomycin, and after 24 hours, AR expression was examined at the protein level. Among them, cp-asiRNA #72(7,4), #78(7,4) (4,4) (2,4), and #110(7,4) (4,4) exhibited target gene protein expression inhibitory efficiency of 50% or higher at a concentration of 1 μM on the basis of the band intensity of a no treatment (NT) sample and a ½ NT sample (see FIG. 14).

While the present invention has been described in detail with reference to specific embodiments thereof, it will be obvious to those of ordinary skill in the art that these embodiments are provided for illustrative purposes only and are not intended to limit the scope of the present invention. Therefore, the actual scope of the present invention will be defined by the appended claims and equivalents thereof.

INDUSTRIAL APPLICABILITY

A 5α-reductase type 1-encoding gene, a 5α-reductase type 2-encoding gene, and an androgen receptor-encoding gene, which play a major role in inhibiting the synthesis of proteins required for hair follicle growth in male pattern hair loss and inducing hair loss by reducing the size of the dermal papilla, were selected as target genes, and asymmetric siRNA with high inhibitory efficiency against each target gene was selected. siRNA according to the present invention exhibits the ability to inhibit the expression of the target gene for 5α-reductase type 1, 5α-reductase type 2, or an androgen receptor, and thus may be effectively used as an agent for preventing or treating hair loss.

While the present invention has been particularly shown and described with reference to specific embodiments thereof, it will be obvious to those of ordinary skill in the art that such embodiments are provided for illustrative purposes only and are not intended to limit the scope of the present invention. Therefore, the actual scope of the present invention should be defined by the appended claims and equivalents thereof.

SEQUENCE LIST FREE TEXT

Electronic files attached. 

The invention claimed is:
 1. The siRNA specifically binding to mRNA of an androgen receptor (AR)-encoding gene having SEQ ID NO: 673 and comprising a sense strand consisting of the sequence of SEQ ID NO: 500 and an antisense strand complementary to the sense strand and consisting of the sequence of SEQ ID NO: 618, wherein a 3′-terminus of the sense strand and a 5′-terminus of the antisense strand form a blunt end.
 2. The siRNA according to claim 1, wherein the sense strand or antisense strand of the siRNA comprises at least one chemical modification.
 3. The siRNA according to claim 2, wherein the chemical modification comprises at least one selected from the group consisting of: a modification in which an —OH group at a 2′ carbon position of a sugar structure in a nucleotide is substituted with —CH₃ (methyl), —OCH₃ (methoxy), —NH₂, —F (fluorine), —O-2-methoxyethyl-O-propyl, —O-2-methylthioethyl, —O-3-aminopropyl, or —O-3-dimethylaminopropyl; a modification in which oxygen in a sugar structure in a nucleotide is substituted with sulfur; a modification of a nucleotide bond to a phosphorothioate, boranophosphate or methyl phosphonate; a modification to peptide nucleic acid (PNA), locked nucleic acid (LNA), or unlocked nucleic acid (UNA); and cholesterol or cell-penetrating peptide binding.
 4. The siRNA according to claim 2, wherein the chemical modification is substitution of an —OH group at a 2′ carbon position of a sugar structure in a nucleotide with —CH₃ (methyl), modification of a nucleotide bond to a phosphorothioate, or cholesterol binding.
 5. The siRNA according to claim 4, wherein the chemical modification comprises at least one selected from the group consisting of: a modification in which the —OH group at the 2′ carbon position of a sugar structure in the 5′- or 3′-terminus nucleotide of the sense strand is substituted with —CH₃ (methyl); a modification in which the —OH group at the 2′ carbon position of a sugar structure in two or more nucleotides of the sense strand or the antisense strand is substituted with —CH₃ (methyl); a modification of 25% or more of bonds between nucleotides in the sense or antisense strand to phosphorothioate; and cholesterol binding at the 3′-terminus of the sense strand.
 6. A composition for preventing or treating hair loss, the composition comprising the siRNA according to claim
 1. 